Wikispaces : chessprogramming - items matching description

asmFish

GerdIsenberg — Wed, 14 Feb 2018 19:45:35 GMT

Home * Engines * Stockfish * asmFish

		asmFish, a port of Stockfish in x86-64 assembly by Mohammed Li, optional using AVX2 and BMI2 instructions, assembled with FASM to run under Windows or UNIX/Linux, first released in June 2016. The fun project is about to demonstrate how an experienced assembly programmer can optimize a program compared with GCC ^[1] . A few structural optimizations were also applied, such as elimination of piece lists as already tried in Stockfish ^[2] . Critical functions in asmFish do not conform to the x86-64 ABI concerning register usage and calling convention ^[3]. Some less time critical code was ported using GCC generated assembly output, such as Ronald de Man's probing code for Syzygy Bases. asmFish further supports large pages, and its parallel search is numa aware ^[4] ^[5] .
Istiophorus platypterus, one of the world's fastest fish ^[6]

Forum Posts

2015

[for fun] rewrite of stockfish into asm and question on source by Mohammed Li, FishCooking, January 09, 2015
Re: [for fun] rewrite of stockfish into asm and question on source by Mohammed Li, FishCooking, April 18, 2016

2016

new humanistic compile of SF is 108KB by Mohammed Li, FishCooking, May 28, 2016
Re: Speedup and simplicity idea by Mohammed Li, FishCooking, June 28, 2016
ASM Fish for Linux and Windows by Norbert Raimund Leisner, CCC, July 26, 2016
asmFish 44 cores by A. Turkoglu, FishCooking, August 28, 2016
Scaling of Asmfish with large thread count by Dann Corbit, CCC, October 07, 2016 » Parallel Search
New asmFish released by Stefan Pohl, CCC, November 04, 2016

2017 ...

Reaching Lyudmil Antonov by Art Ford, CCC, January 23, 2017
asmfish_macOS_11082017 by Michael B, CCC, November 08, 2017
asmFish update - all flavors of OS by Michael B, CCC, January 20, 2018
Re: asmFish update - all flavors of OS by T. Poppins, CCC, January 23, 2018
New asmfish by Günther Simon, CCC, February 12, 2018

External Links

Chess Engine

Misc

Yes - We Have Heaven, Long Distance Runaround, The Fish (Schindleria Praematurus), Album Fragile (1971), YouTube Video

References

^ Re: [for fun] rewrite of stockfish into asm and question on source by Mohammed Li, FishCooking, April 18, 2016
^ removal of piece lists by Mohammed Li, FishCooking, November 11, 2014
^ Agner Fog's manuals
^ asm/readme.txt at master · tthsqe12/asm · GitHub
^ lets get the ball moving down the field on numa awareness by Mohammed Li, FishCooking, August 30, 2016
^ Istiophorus platypterus, Image by Citron, March 2010, CC BY-SA 3.0, Wikimedia Commons, Sailfish from Wikipedia, Indo-Pacific sailfish from Wikipedia

What links here?

Page	Date Edited
asmFish	Feb 14, 2018
Assembly	Sep 3, 2017
CFish	Feb 1, 2018
Engines	Mar 10, 2018
Lyudmil Antonov	Aug 31, 2017
Memory	Dec 8, 2017
Parallel Search	Dec 30, 2017
Portfish	Sep 8, 2016
Stockfish	Apr 7, 2018
x86-64	Mar 6, 2018

Up one Level

Brainfish

GerdIsenberg — Sun, 08 Oct 2017 18:17:55 GMT

Home * Engines * Brainfish

		Brainfish, a Stockfish based chess engine introduced by Thomas Zipproth in July 2016 ^[1] , which contains a spin-off of the engine independent Cerebellum library, which keeps a self generated, persistent tree of minimaxed, deeply analyzed chess positions ^[2] ^[3] , used as playing or opening book with one or two best moves per node available but without score informations. The initial Brainfish release of July 2016 consists of about 4.4 million positions, containing the most frequently played positions from engine games, human games, and some positions of rating list. A tool for viewing and maintaining the tree is announced to become commercially available in November 2016 through the Sirius GUI by Stefan Zipproth ^[4] ^[5] ^[6] .
Vox Piscis ^[7]

Forum Posts

SPCC: Testruns of BrainFish 160610 and 160712 finished by Stefan Pohl, CCC, July 24, 2016
BrainFish / Cerebellum-Library by A. Turkoglu, FishCooking, July 24, 2016
Brainfish, a new concept of a chess engine by Thomas Zipproth, CCC, July 25, 2016
Brainfish Numa 2 questions by Jean Arthuin, CCC, September 24, 2016

External Links

References

^ Brainfish, a new concept of a chess engine by Thomas Zipproth, CCC, July 25, 2016
^ Michael Buro (1999). Toward Opening Book Learning. ICCA Journal, Vol. 22, No. 2, pdf
^ Anybody tried Logistello's book learning for chess? by Rémi Coulom, CCC, December 29, 2013
^ BrainFish FAQ
^ New chess interface (soon) by Michael Diosi, CCC, May 16, 2011
^ Von Aristarch zu Sirius by Michael Scheidl, CSS Forum, May 16, 2011 (German)
^ The 1627 reprint is entitled Vox Piscis, or, The book-fish contayning three treatises which were found in the belly of a cod-fish in Cambridge Market, on Midsummer Eue last, anno Domini 1626. Images from Folger Shakespeare Library, source creator: John Frith (1503 - 1533), see also Chambers' Book of Days - June 23rd, The Book—Fish edited by Michael Hillman

What links here?

Page	Date Edited
Book Learning	Jan 1, 2017
Brainfish	Oct 8, 2017
Engines	Mar 10, 2018
Ferdinand Mosca	Jul 28, 2017
McBrain	Feb 14, 2018
Opening Book	Feb 26, 2018
Stefan Pohl	Jan 14, 2018
Stockfish	Apr 7, 2018

Up one Level

CCCP (US)

GerdIsenberg — Fri, 22 Dec 2017 08:16:18 GMT

Home * Engines * CCCP

		CCCP, the Columbia Computer Chess Program developed by a group of students at Columbia University, Steven M. Bellovin, Aron Eisenpress, Andrew Koenig, and Ben Yalow, written in PL/I. CCCP played the ACM 1971, where it ran on IBM 360/91 at Columbia University. The project already started during the ACM 1970 in collaboration with Hans Berliner from Carnegie Mellon University, when J. Biit was operated through a chess GUI written at Columbia for the IBM 2250 Display Unit. The four students continued to develop J. Biit, replacing the back end with a much better set of algorithms, evolving into CCCP (a pun on the Cyrillic abbreviation for the official name of the Soviet Union, Сою́з Сове́тских Социалисти́ческих Респу́блик) after one year of effort ^[1] .
Flying USSR flag ^[2]

Selected Games

The Computer Was a Fish

Selected Games

ACM 1971, round 3, CCCP - David ^[3]

[Event "ACM 1971"]
[Site "Chicago USA"]
[Date "1971.08.04"]
[Round "3"]
[White "CCCP"]
[Black "David"]
[Result "1/2-1/2"]
 
1.e4 e6 2.d4 Nc6 3.Nc3 g5 4.Bb5 a6 5.Bxc6 dxc6 6.Be3 b5 7.Qh5 b4
8.Bxg5 Nf6 9.Bxf6 Qxf6 10.e5 Qg7 11.Ne4 Qxg2 12.Qf3 Qxf3 13.Nxf3
Bh6 14.Nf6+ Ke7 15.a3 bxa3 16.Rxa3 Rb8 17.O-O Rxb2 18.c4 a5 19.Rxa5
Rb3 20.Kg2 Rxf3 21.Kxf3 Bd2 22.Rc5 Bc3 23.Rxc6 Bb7 24.Nd5+ exd5
25.Rxc7+ Ke6 26.Rxb7 dxc4 27.Rb6+ Kf5 28.Rf6+ Kg5 29.Rg1+ Kh5
30.Rf5+ Kh6 31.Rf6+ Kh5 32.Rf5+ Kh6 33.Rf6+ Kh5 34.Rf5+ 1/2-1/2

The Computer Was a Fish

		In his essay The Computer Was a Fish, published in Analog Science Fiction and Fact, August 1972 ^[4], George R. R. Martin mentions the ACM 1971 and a computer chess program called CCCP, which had a certain Mr. Benjamin Yalow on the team ^[5]. The essay inspired Charles F. and Charlie Wilkes to write their program The Fox ^[6].
Analog, August 1972 ^[7]

Namesake

CCCP by Pawel Koziol

Publications

Andrew Koenig (1978). Light-Pen used in game. Personal Computing, Vol. 2, No. 5, pp. 112

External Links

References

^ Recollections of CUCC 1968-70 -The CCCP Chess Program
^ Flag of the Soviet Union, file from the Prelinger Archives, which released it explicitly into the public domain, using the Creative Commons Public Domain Dedication, Wikimedia Commons
^ PGN Download NACCC from Computerschaak/Downloads/Games hosted by CSVN
^ George R. R. Martin (1972). The Computer Was a Fish. Analog Science Fiction/Science Fact, August 1972
^ The Drink Tank 319 - Hugo for Best Novel | Chris Garcia - Editors - James Bacon (pdf)
^ Computer Chess Newsletter, Issue 2 1977 by Douglas Penrod, Charles F. Wilkes pp. 6-9, Courtesy of Peter Jennings, pdf reprint from The Computer History Museum
^ Cover art by Frank Kelly Freas, supplied by Visco, Analog Science Fiction/Science Fact, August 1972

What links here?

Page	Date Edited
ACM 1971	Jul 19, 2016
Andrew Koenig	Dec 22, 2017
Aron Eisenpress	Jul 8, 2012
Ben Yalow	Jan 21, 2013
CCCP	Jan 10, 2013
CCCP (US)	Dec 22, 2017
Charles F. Wilkes	Oct 6, 2014
Charlie Wilkes	Oct 6, 2014
Columbia University	Oct 13, 2016
David	Jul 20, 2016
Engines	Mar 10, 2018
IBM 360	Jan 2, 2016
J. Biit	Jan 17, 2017
Personal Computing	Dec 27, 2017
PL 1	Jan 20, 2016
Steven M. Bellovin	Dec 14, 2017
The Fox	Feb 27, 2017

Up one level

CFish

GerdIsenberg — Thu, 01 Feb 2018 18:55:27 GMT

Home * Engines * Stockfish * CFish

		CFish, a port of Stockfish written in plain C by Ronald de Man, first published on GitHub in July 2016. Possibly inspired by the asmFish project to speed up Stockfish using a programming language closer to the machine, the purpose of CFish is to explore possible optimization issues of C versus C++ compilers ^[1].
Joachim Beuckelaer - Fish Market ^[2]

Forum Posts

2016

CFish by Dann Corbit, CCC, August 31, 2016
Cfish solves the dreaded URI hard problem by Dann Corbit, CCC, September 05, 2016
cfish for the mac by Michael B, CCC, September 11, 2016 » Macintosh
New CFish Windows binary (from today's code) by Dann Corbit, CCC, October 13, 2016
Cfish for the Mac by Michael B, CCC, October 17, 2016
Cfish 8 for the MacOS by Michael B, CCC, November 05, 2016

2017 ...

Cfish update -> macOS exe's for download by Michael B, CCC, November 13, 2017
Cfish-54302a... Search of startpos to depth 50 by Louis Zulli, CCC, January 17, 2018 » Initial Position
Cfish 9 is OUT! by Louis Zulli, CCC, January 31, 2018

External Links

GitHub - syzygy1/Cfish: C port of Stockfish

References

^ Re: CFish by Louis Zulli, CCC, September 01, 2016
^ Fish Market by Joachim Beuckelaer 16th century, Bonnefantenmuseum, Maastricht, Wikimedia Commons, Cod from Wikipedia

What links here?

Page	Date Edited
asmFish	Feb 14, 2018
CFish	Feb 1, 2018
Engines	Mar 10, 2018
Initial Position	Apr 14, 2018
Portfish	Sep 8, 2016
Ronald de Man	Nov 20, 2017
Stockfish	Apr 7, 2018
Syzygy Bases	Apr 19, 2018

Up one Level

Dorky

GerdIsenberg — Mon, 10 Oct 2016 20:33:33 GMT

Home * Engines * Dorky

		Dorky, (Dorky Chess) a WinBoard compatible engine for Windows written by Matt McKnight in C/C++, first released in May 2003 ^[1]. Dorky already played the CCT2 in 2000, and Dorky 4.0 the CCT6 tournament. Dorky 4.x, a rewrite of most major components, was the first release of a new version after almost seven years in May 2011, with access to Nalimov Tablebases and a parallel search ^[2].
Dorky, the Snapper ^[3] ^[4]

Features

Following algorithms and features are used in Dorky Chess 4.3 ^[5]

PVS alpha-beta with quiescence search
SMP search using Dr. Hyatt’s DTS algorithm
Nalimov Endgame tablebases
Late move reductions
Futility pruning
Transposition hash table / Pawn evaluation hash table (using Hyatt’s lockless approach)
Null-move pruning
Killer move heuristic
Bitboards, rotated bitboards for move generation
Static exchange evaluation
Opening Book creation and simple learning

Selected Games

CCT2

CCT2, round 1, Junior - Dorky ^[6]

[Event "CCT2"]
[Site "Internet Chess Club"]
[Date "2000.11.04"]
[Round "1"]
[White "Junior"]
[Black "Dorky"]
[Result "1-0"]
 
1.e4 e6 2.d4 d5 3.Nd2 c5 4.Ngf3 Nc6 5.Bb5 cxd4 6.Nxd4 Bd7 7.Bxc6 bxc6 8.O-O Bd6 
9.c4 Nf6 10.Re1 Qc7 11.N4f3 Nxe4 12.Nxe4 dxe4 13.Rxe4 Bc8 14.Rg4 f6 15.Be3 O-O 
16.c5 Be7 17.Qc2 Rd8 18.Rh4 f5 19.Rd4 Rd5 20.Bf4 Qd8 21.Rxd5 Qxd5 22.Bd6 Bxd6 
23.cxd6 Qxd6 24.Rd1 Qf8 25.Ne5 c5 26.Qa4 Rb8 27.Nc6 Rxb2 28.f4 Bb7 29.Rd8 Rxg2+ 
30.Kf1 Bxc6 31.Rxf8+ Kxf8 32.Qxc6 Rxh2 33.Qxc5+ Kf7 34.Qxa7+ Kf6 35.Qd4+ Kf7 
36.a4 Ra2 37.Qd7+ Kf6 38.a5 h6 39.Qd8+ Kg6 40.Qb6 h5 41.Qxe6+ Kh7 42.Qxf5+ Kg8 
43.Qe6+ Kf8 44.Qxa2 Ke7 45.Qg8 Kf6 46.Qxg7+ Kxg7 47.a6 Kg6 48.a7 Kf5 49.a8=Q
1-0

CCT6

CCT6, round 7, Dorky - Chiron ^[7]

[Event "CCT6"]
[Site "Internet Chess Club"]
[Date "2004.02.01"]
[Round "7"]
[White "Dorky 4.0"]
[Black "Chiron "]
[Result "1-0"]
 
1.d4 Nf6 2.c4 c6 3.Nf3 d6 4.Nc3 Nbd7 5.e4 e5 6.Be2 Be7 7.Qd2 O-O 8.O-O exd4 
9.Nxd4 d5 10.exd5 cxd5 11.Rd1 Nb6 12.cxd5 Nfxd5 13.Ndb5 Be6 14.Bf3 Bb4 15.Qg5 
Qxg5 16.Bxg5 Bxc3 17.Nxc3 Nxc3 18.bxc3 Rac8 19.Rac1 Na4 20.Bxb7 Rc7 21.Bf3 Rxc3 
22.a3 Rfc8 23.h3 f6 24.Bd2 Rxc1 25.Bxc1 Nb6 26.Be3 Kf7 27.Rb1 Bf5 28.Rb5 Bd7 
29.Ra5 Rc7 30.Bf4 Rc4 31.Bb8 Rc8 32.Bg3 Rc1+ 33.Kh2 Nc8 34.Bb8 Ke6 35.a4 Rc2 
36.Kg3 Ne7 37.Bxa7 Bc6 38.Bxc6 Rxc6 39.Rb5 Nf5+ 40.Kh2 Nd6 41.Rb4 Rc4 42.Rxc4 
Nxc4 43.Bc5 Kd5 44.Bb4 Nb2 45.a5 Kc6 46.Kg3 Nc4 47.Kf4 Kb5 48.Bf8 g6 49.Bg7 
Kxa5 50.Bxf6 Nd6 51.Ke5 Ne8 52.Ke6 Kb5 53.Be5 Kc4 54.Ke7 Kd5 55.f4 Ke4 56.Kxe8 
Kd5 57.Ke7 Ke4 58.Ke6 Ke3 59.g4 Kf3 60.f5 1-0

Forum Posts

2003

Dorky Chess download site by Matt McKnight, CCC, June 30, 2003
Dorky 3.43 by Matt McKnight, CCC, July 03, 2003
Dorky 3.44 released by Matt McKnight, CCC, July 14, 2003
Dorky 3.45 Released by Matt McKnight, CCC, July 25, 2003
Dorky 3.47 Released by Matt McKnight, Winboard Forum, September 05, 2003
Dorky 3.48 by Matt McKnight, Winboard Forum, September 25, 2003

2011

Dorky 4.0 released by Matt McKnight, CCC, May 19, 2011
Dorky 4.1 Released by Matt McKnight, CCC, May 25, 2011
Dorky 4.0 and the 50-move rule by Gabor Szots, CCC, May 29, 2011
Dorky 4.0 and 3-fold repetition by Gabor Szots, CCC, May 29, 2011
Dorky is lot better than I thought by Fernando Villegas, CCC, June 08, 2011
Dorky 4.1 64-bit - always single-threaded? by Gabor Szots, CCC, June 17, 2011
Dorky 4.2 released by Matt McKnight, CCC, June 27, 2011
Dorky 4.2 64-bit 2CPU time losses - very long post? by Gabor Szots, CCC, July 04, 2011
Dorky 4.3 Released by Matt McKnight, CCC, July 24, 2011
Dorky 4.3 64-bit - odd memory usage by Gabor Szots, CCC, September 21, 2011

2016

Dorky v4.5 Released by Matt McKnight, CCC, September 25, 2016

External Links

Chess Engine

Misc

Urban Dictionary: dorky
dorky - Wiktionary
dork - Wiktionary
Dork (disambiguation) from Wikipedia
Constanza Macras | Dorky Park - Open for Everything, June 05-06, 2012, Laterna Magika, National Theatre, Prague, YouTube Video ^[8]

References

^ Dorky from WBEC Ridderkerk
^ Dorky 4.0 released by Matt McKnight, CCC, May 19, 2011
^ Large snapper caught off Frankston, Victoria in 1893, photographed by Pengo at Melbourne Museum, from Australasian snapper from Wikipedia
^ Australasian snapper, a species of sparidae fish sometimes called "dork", Dork (disambiguation) from Wikipedia
^ Dorky Chess Download, Dorky4.3-win-x86.zip / Dorky Chess 4.3 pdf
^ CCT2 - PGN download hosted by Volker Richey
^ CCT6 - PGN download hosted by Volker Richey
^ Praha - Kalendář akcí (Czech), Prag - Veranstaltungen (German) - Goethe-Institut Prague

What links here?

Page	Date Edited
CCT2	Sep 7, 2012
CCT6	May 29, 2014
Dorky	Oct 10, 2016
Engine releases	Apr 23, 2018
Engines	Mar 10, 2018
Fernando Villegas	Aug 15, 2016
Matt McKnight	Oct 10, 2016

Up one level

DroidFish

GerdIsenberg — Tue, 17 Jan 2017 15:05:19 GMT

Home * Engines * DroidFish

DroidFish,
a standalone UCI compliant chess application for Android platforms by Peter Österlund. It incorporates the GUI and opening book code derived from CuckooChess by Peter Österlund, the CuckooChess Java chess engine, and the Stockfish chess engine by Tord Romstad, Marco Costalba and Joona Kiiski. The port of Stockfish didn't involve changing the Stockfish source code, but finding a compatible STL implementation for Android, and compiling the source code with the correct combination of compiler flags as a library which is accessed using JNI ^[1] . Further, since version 1.4, DroidChess supports Gaviota Tablebases and includes the probing code by Miguel A. Ballicora ^[2], and since version 1.55, Syzygy Bases ^[3].

Images

DroidFish analyzing the Lasker-Reichhelm Position ^[4]

Forum Posts

Re: Engines/GUI for Android? by Peter Österlund, CCC, July 12, 2010
Re: Chess for Android with UCI support released by Peter Österlund, CCC, September 12, 2010
DroidFish 1.40 by Peter Österlund, CCC, January 29, 2012
Droidfish, thanks to the developer ... by Frank Quisinsky, CCC, February 05, 2013
Droidfish now allowing changing of UCI options not working by Keelan Waldron, CCC, October 21, 2014
Re: Chess for Android - set time controls? by Peter Österlund, CCC, October 27, 2014

External Links

Chess Program

Misc

References

^ Re: Chess for Android with UCI support released by Peter Österlund, CCC, September 12, 2010
^ DroidFish 1.40 by Peter Österlund, CCC, January 29, 2012
^ DroidFish Chess - Android Apps on Google Play
^ DroidFish - Strong chess program for the Android platform

What links here?

Page	Date Edited
Chess for Android	Mar 1, 2018
CuckooChess	Jan 17, 2017
DroidFish	Jan 17, 2017
Engines	Mar 10, 2018
GUI	Mar 16, 2018
Peter Österlund	Aug 24, 2017
Portfish	Sep 8, 2016
Stockfish	Apr 7, 2018

Up one Level

Fischerle

GerdIsenberg — Mon, 21 Aug 2017 19:03:14 GMT

Home * Engines * Fischerle

		Fischerle, a Java-based chess engine that has been developed by Roland Stuckardt. Fischerle implements the UCI protocol. It is recommended to employ it from within the Arena environment. Additionally, Fischerle has an own GUI providing supplementary configuration and testing features; in principle, it can thus be used independently of UCI based chess GUIs. Fischerle is available for download at its author's web pages .
Fischerle Logo

Technology

Fischerle’s representation of chess positions is based on the rotated bitboard model. Fischerle employs some well-known techniques of enhanced alpha-beta minimax search:

NegaScout algorithm
Iterative deepening (ID) and IID
Aspiration windows
History heuristic
Killer heuristic
Hash tables
Transposition table
Evaluation cache
Quiescence search
Search extensions:
Promotions
7th rank Passed pawn extensions
Check evasions only by a singular / a few moves
Winning recaptures
Singular extensions (restricted implementation that doesn't apply at Cut nodes and that considers only transposition table moves as singularity candidates the value of which is marked there as exact or lower bound)
extension by several plies at the very moment a pawn endgame is reached
Tactically painless reductions according to the enhanced model suggested by Ernst A. Heinz
Adaptive Null Move Pruning
Extended Futility Pruning
Limited Razoring
Late Move Reductions
Interior node recognition similar to Heinz’s proposal ^[1]
Dedicated scoring functions for some particular endgame types

The static evaluation parameters of Fischerle are amenable to external fine tuning based on a concept of so-called efb (evaluation factor block) files, thus enabling the user to influence, within certain bounds, Fischerle’s playing style (e. g. to prefer closed positions, etc.). Fischerle comes with its own, small opening book, covering about 220K positions and some 540K moves. Fischerle supports pondering via its UCI interface.

Performance

According to extensive test tournaments, Fischerle is sufficiently well equipped with chess wit in order to compete in the CCRL 40/40 Elo 2250-2350 range. Fischerle 0.9.70 SE has been ranked at place 235 of the CCRL 40/40 list with a CCRL 40/40 Elo score of 2291 (March 25, 2017).

Latest Version

Fischerle 0.9.80 SE (March 24, 2017) - a slightly more aggressive forward pruning scheme is now applied; quiescence search has been mildly refined (adding, in particular, delta pruning); the piece value assigned to bishops and the bishop pair bonus have been slightly reduced; king safety ealuation has been refined; the mate approaching scheme has been enhanced.

Etymology

"Ein Mensch, was ka Schach spielt, ist ka Mensch" ^[2]

Auto-da-Fé

		Fischerle ^[3] is named after a famous character of Elias Canetti’s novel „Die Blendung“ („Auto-da-Fé“) ^[4] ^[5] , which plays in Vienna ^[6] around protagonist Peter Kien, a middle-aged philologist and Sinologist: Siegfried Fischerle ^[7] , a Jewish ^[8] hunchbacked dwarf and pander, is a chess addict whose dream is it to go to America to challenge chess champion José Raúl Capablanca in order to get rich and famous. Canetti wrote his novel in the years 1930/31, coincidentally more than one decade before Nazi German Oberfeldwebel Siegfried Fischer was decorated with the Knight's Cross of the Iron Cross, Jewish artist and poet Peter Kien died in Auschwitz concentration camp, and more than two decades before chess genius Bobby Fischer entered the international chess scene ^[9] .
Die Blendung by Doris Neidl ^[10]

Publications

^[11]

Elias Canetti (1936). Die Blendung. Wien 1936, Editio princeps (German)
Elias Canetti (1946). Auto-da-Fe. Translated by Veronica Wedgwood
Peter Jansen (1980). Die Komik des Sprechens. Zur sprachlich-ästhetischen Erfahrung des Komischen am Beispiel von Canettis Roman "Die Blendung". in Sprache im technischen Zeitalter, 76 (German)
Nicola Riedner (1994). Canettis Fischerle: eine Figur zwschischen Masse, Macht und Blendung. Königshausen und Neumann (German)
Harriet Murphy (1996). Canetti and Nietzsche: Theories of Humor in Die Blendung. State University of New York Press ^[12]
Ritchie Robertson (1999). The 'Jewish Question' in German Literature 1749 - 1939 Emancipation and Discontents. Oxford University Press ^[13]
William Collins Donahue (2001). The End of Modernism : Elias Canetti's Auto-da-fâe. University of North Carolina Press ^[14]
Marcus Puknatis (2002,2007). Elias Canettis 'Die Blendung' - Typische Österreichische Nationalliteratur? GRIN Verlag (German)
Yun Chen (2003). Canetti und die chinesische Kultur. Dissertation, Heinrich Heine University Düsseldorf (German)
Hidas Ildikó (2008). Elias Canettis Roman Die Blendung im Schnittpunkt zeitgenössischer Diskurse. Ph.D. thesis, Pázmány Péter Catholic University, Piliscsaba, pdf (German)

Fischers Fritz

The German tongue-twister "Fischers Fritz fischt frische Fische. Frische Fische fischt Fischers Fritz." (Fisher's Fritz fishes fresh fish, fresh fish are fished by fisher's Fritz) is not related to Fritz Fischer but may be to Fischerle's famous brother Fritz?

Forum Posts

2014

Nice move by Fischerle (Division 7 engine in my Amateurs) by Graham Banks, CCC, January 11, 2014
A good 64-bit Java chess engine unknown here by Ruxy Sylwyka, CCC, February 12, 2014
No GUI problems with Fischerle by Norbert Raimund Leisner, CCC, February 18, 2014
Re: 32-bit and 64-bit java engines by Roland Stuckardt, CCC, February 24, 2014
New Fischerle Versions (64 and 32 Bit) by Roland Stuckardt, CCC, May 15, 2014
New Fischerle Version: 0.9.60 by Roland Stuckardt, CCC, October 07, 2014

2015 ...

New Fischerle Version: 0.9.65 by Roland Stuckardt, CCC, September 17, 2015
New Fischerle Version: 0.9.70 SE by Roland Stuckardt, CCC, March 25, 2016
New Fischerle Version: 0.9.80 SE by Roland Stuckardt, CCC, March 24, 2017

External Links

Chess Engine

Misc

Fischer - Wiktionary
Fischer from Wikipedia
Bobby Fischer from Wikipedia
Auto-da-Fé from Wikipedia
Fisherman from Wikipedia
Fish from Wikipedia
Fish anatomy from Wikipedia
Fischerle - The Love Bruises, YouTube Video

References

^ Ernst A. Heinz (1998). Efficient Interior-Node Recognition. ICCA Journal, Vol. 21, No. 3
^ "A person who does not play chess, is not a man", direct speech in Viennese German of Fischerle to Kien, in
Elias Canetti (1936). Die Blendung. Wien 1936, Editio princeps, p. 191.
^ Fischerle - Diminutive form of Fischer
^ Auto-da-fé from Wikipedia
^ Talk Literature: Auto-da-Fé - Elias Canetti by Lale, February 21, 2010
^ History of the Jews in Vienna - from Wikipedia
^ Nicola Riedner (1994). Canettis Fischerle: eine Figur zwischen Masse, Macht und Blendung. Königshausen und Neumann, page 40, footnote 174, Google books, "Peter Jansen behauptet fälschlicherweise, daß Fischerle eigentlich Fischer hieße und nur aufgrund seiner Gestalt das Verkleinerungssuffix durch andere hinzubekommen hätte". Peter Jansen (1980). Die Komik des Sprechens. Zur sprachlich-ästhetischen Erfahrung des Komischen am Beispiel von Canettis Roman "Die Blendung". in Sprache im technischen Zeitalter, 76
^ further in Nicola Riedner (1994). Canettis Fischerle: eine Figur zwschischen Masse, Macht und Blendung. Königshausen und Neumann, page 41-42, During the time of writing of the novel (1930/31) the German given name Siegfried for Jewish children was indication of Jewish will for assimilation, footnote 179, Konrad Krause (1943). Die jüdische Namenswelt. Essener Verlagsanstalt, Publisher of the Nazi Party, S. 11, "Denn es ist bekannt, in welchem Ausmaß die Juden [...] unsere herrlichen alten Namen z.T. nahezu entwertet haben. Dieses Schicksal erlitten besonders die 'Sieg'namen ..."
^ Bobby Fischer, whose mother was Jewish, and whose possible biological father was also Jewish, made numerous Anti-semitic statements, see Bobby Fischer - Anti-semitic statements - from Wikipedia
^ Die Blendung - Illustrations - Gallery, capturing the crazy and wondrous journey of Sinologist Peter Kien. Copyright © 2013 by Doris Neidl
^ Elias Canetti: Sekundärliteratur (German)
^ Friedrich Nietzsche from Wikipedia
^ Jewish question from Wikipedia
^ German: Willkommen

What links here?

Page	Date Edited
Bobby	Jan 7, 2016
Engine releases	Apr 23, 2018
Engines	Mar 10, 2018
Fischerle	Aug 21, 2017
Java	Feb 25, 2018
Roland Stuckardt	Jul 14, 2017

Up one level

Galjoen

GerdIsenberg — Mon, 19 Mar 2018 07:59:55 GMT

Home * Engines * Galjoen

		Galjoen, an open source chess program by Werner Taelemans, written in C++11 and distributed under the GNU General Public License, first released in February 2015 ^[1]. Galjoen comes with an own GUI build on gtkmm3, but can also ran as pure engine using the Chess Engine Communication Protocol or UCI. Galjoen 0.35, released in March 2017 is able to play Chess960 ^[2].
Galjoen ^[3]

Features

^[4]

Move Generation

Magic Bitboards

Search

Evaluation

Misc

Forum Posts

2015

new gui, new engine by Werner Taelemans, CCC, February 05, 2015
Galjoen version 0.28 released by Werner Taelemans, CCC, May 07, 2015
Galjoen version 0.29 available by Werner Taelemans, CCC, June 02, 2015
Galjoen_v0.31 by Werner Taelemans, CCC, November 08, 2015

2016

Galjoen v0.32 released by Werner Taelemans, CCC, February 26, 2016
Galjoen v0.33 released by Werner Taelemans, CCC, November 13, 2016

2017

Galjoen 0.35 by Werner Taelemans, CCC, March 04, 2017
Galjoen 0.36 by Werner Taelemans, CCC, June 06, 2017
Galjoen 0.37 by Werner Taelemans, CCC, December 03, 2017

2018

Galjoen 0.38 by Werner Taelemans, CCC, March 18, 2018

External Links

Chess Program

Misc

References

^ new gui, new engine by Werner Taelemans, CCC, February 05, 2015
^ Galjoen 0.35 by Werner Taelemans, CCC, March 04, 2017
^ Spanish Galleon, Wikimedia Commons
^ Chessprogram Galjoen

What links here?

Page	Date Edited
Engine releases	Apr 23, 2018
Engines	Mar 10, 2018
Galjoen	Mar 19, 2018
PicoChess	Mar 12, 2018

Up one Level

Iron Fish

GerdIsenberg — Thu, 08 Sep 2016 08:43:29 GMT

Home * Engines * Iron Fish

		Iron Fish, a mainframe chess program of the mid 70s by Gary Boos and James Mundstock affiliated with the University of Minnesota. Iron Fish played the ACM 1975 running on a CDC Cyber 74, where it lost from Chute 1.2 and Duchess, and drew from Sortie and Ostrich.
Iron Fish - Steinhude pike ^[1]

Selected Games

ACM 1975, round 4, Ostrich - Iron Fish ^[2]

[Event "ACM 1975"]
[Site "Minneapolis USA"]
[Date "1975.10.21"]
[Round "4"]
[White "Ostrich"]
[Black "Iron Fish"]
[Result "1/2-1/2"]
 
1.e4 d5 2.exd5 Qxd5 3.Nc3 Qe5+ 4.Nge2 Nf6 5.d4 Qa5 6.Be3 Bf5 7.Ng3 Bg4 
8.Be2 Bxe2 9.Qxe2 Nbd7 10.O-O Qb4 11.Qb5 Qxb5 12.Nxb5 O-O-O 13.Nxa7+ Kb8 
14.Nb5 e5 15.dxe5 Nxe5 16.Bg5 Bb4 17.Bxf6 gxf6 18.c3 Rd5 19.Nxc7 Rd2 
20.cxb4 Kxc7 21.b3 Kc6 22.Ne4 Re2 23.Rfe1 Rxe1+ 24.Rxe1 f5 25.Ng3 Nd3 
26.Re7 f4 27.Nh5 f5 28.a3 Ra8 29.a4 b5 30.Rxh7 bxa4 31.Rh6+ Kc7 32.Rh7+ 
Kc6 33.Rh6+ Kc7 34.bxa4 Rxa4 35.Rh7+ Kd6 36.Rh6+ Ke5 37.Kf1 Ra1+ 38.Ke2 
Nxb4 39.h4 Rc1 40.Rb6 Nd5 41.Rh6 Rc2+ 42.Kf3 Rc3+ 43.Ke2 Rc2+ 44.Kf1 Rc1+ 
45.Ke2 Rc2+ 1/2-1/2

External Links

References

^ Drawing of the late-1700s experimental submarine called the Steinhude pike, first German submarine 1772, Wikimedia Commons, Steinhuder Hecht from Wikipedia
^ David Levy (ed.) (1988). Computer Chess Compendium. Chapter 9.1 Games from the ACM Tournaments

What links here?

Page	Date Edited
ACM 1975	Jan 19, 2018
CDC Cyber	Dec 22, 2017
Engines	Mar 10, 2018
Gary Boos	Apr 10, 2013
Iron Fish	Sep 8, 2016
James Mundstock	Apr 10, 2013
Mr. Turk	Feb 21, 2015
Sortie	Jan 5, 2016

Up one level

McBrain

GerdIsenberg — Wed, 14 Feb 2018 19:47:28 GMT

Home * Engines * Stockfish * McBrain

		McBrain, a Stockfish fork maintained by Michael Byrne in his GitHub repository ^[1] Mac OS executables included, renamed at the request of the Stockfish authors to avoid confusion with official stockfish releases, first published in January 2017 ^[2]. McBrain features the Cerebellum book and code used by Brainfish by Thomas Zipproth. It includes a number of Stockfish development patches that passed short time control (STC) but failed LTC ^[3]
Dogfish shark brain ^[4]

Forum Posts

2017

McBrain 2017 by Michael B, CCC, January 06, 2017
McBrain 2017 v1.2 - A Super Bowl Sunday Stockfish Release by Michael B, CCC, February 06, 2017
McBrain v1.3 Release by Michael B, CCC, February 26, 2017
McBrain v2.0 Release by Michael B, CCC, March 19, 2017
McBrain v2.1 Release by Michael B, CCC, April 02, 2017
final testing for McBrain 2.2 underway... by Michael B, CCC, April 28, 2017
McBrain 2017 v2.2 Release by Michael B, CCC, May 01, 2017
McBrain 2017 v2.4b by Michael B, CCC, June 03, 2017
Stockfish/McBrain 2.5 Release by Michael B, CCC, June 17, 2017
SF-McBrain v3.0 TCEC-X by Michael B, CCC, October 06, 2017 » TCEC Season 10
SF-McBrain v3.0 TCEC-X RELEASE by Michael B, CCC, October 22, 2017
SF-McBrain 4.0 Release by Michael B, CCC, December 26, 2017

2018 ...

McBrain 9 release ... by Michael B, CCC, February 14, 2018

External Links

Chess Engine

Misc

Iron Maiden - Still Life, album Piece of Mind (1983), YouTube Video

References

^ MichaelB7 (Michael Byrne) · GitHub
^ McBrain 2017 by Michael B, CCC, January 06, 2017
^ Release McBrain 2017 v2.5 · MichaelB7/Stockfish · GitHub
^ The original image (1878) of Fritsch's dogfish shark brain showing the terminal nerve marked by an asterisk, Wikimedia Commons

What links here?

Page	Date Edited
Engines	Mar 10, 2018
McBrain	Feb 14, 2018
Michael Byrne	Jun 23, 2017
Stockfish	Apr 7, 2018

Up one Level

Portfish

GerdIsenberg — Thu, 08 Sep 2016 14:58:34 GMT

Home * Engines * Stockfish * Portfish

Portfish,
a .Net port of Stockfish in C# by Balint Pfliegel, functionally equivalent with Stockfish May 27, 2012, commit 0412f4a1ee ^[1], conform to UCI.

Forum Posts

Re: Stockfish port to C# Complete by Balint Pfliegel, CCC, March 21, 2012
Portfish - C# port of Stockfish by Balint Pfliegel, CCC, May 04, 2012
Portfish - call for professional testers by Balint Pfliegel, CCC, May 07, 2012
[.Net only] - fast bit operations by Balint Pfliegel, CCC, June 18, 2012
Re: Question About CPP-C#, Performance, and Square Representation by Balint Pfliegel, CCC, September 30, 2012
Portfish - Windows RT support by Balint Pfliegel, CCC, September 30, 2012

External Links

bpfliegel/Portfish · GitHub

References

^ Portfish/README.md at master · bpfliegel/Portfish · GitHub

What links here?

Page	Date Edited
Alfil	Sep 3, 2015
Balint Pfliegel	Aug 30, 2015
CFish	Feb 1, 2018
DroidFish	Jan 17, 2017
Engines	Mar 10, 2018
Portfish	Sep 8, 2016
Stockfish	Apr 7, 2018

Up one Level

Rybka

GerdIsenberg — Tue, 28 Mar 2017 06:50:34 GMT

Home * Engines * Rybka

		Rybka, a chess engine by primary author Vasik Rajlich, since 2007 dominating and reigning World Computer Chess Champion and holder of the Shannon Trophy, winning the WCCC 2007 ^[1] , WCCC 2008, WCCC 2009 and WCCC 2010, but in June 2011 disqualified by the ICGA from all previous and future World Computer Chess Championships ^[2] . Rybka further won various IPCCC, Dutch Open Computer Chess Championships, International CSVN Tournaments and on-line tournaments such as CCT Tournaments and ACCA Americas' Computer Chess Championships. Rybka is a standalone chess engine supporting the UCI protocol.
Rybka 4 Logo ^[3]

Pre-Beta Rybka and Crafty

Screenshots



ChessBase GUI, 3D boards with scoresheet and analysis board ^[4]

Deep Rybka 4 Aquarium by ChessOK ^[5]

Team

The Rybka team consists of primary author and International Master Vasik Rajlich, supported by Grandmaster and evaluation expert Larry Kaufman (Rybka 3), Rybka's main tester and Women's GM (WGM) and IM Iweta Rajlich, the opening book authors Jeroen Noomen, Dagh Nielsen, Jiří Dufek and Nick Carlin, as well as Rybka primary tournament operator Hans van der Zijden, hardware expert Lukas Cimiotti and Webmaster and Webdesigner Felix and Christoph Kling ^[6] .

Versions

Vasik Rajlich started developing Rybka in about 2003, and worked full-time on it since 2005. The appearance of the free Rybka 1 beta ^[7] ^[8] ^[9] and the first commercial version, Rybka 1 ^[10] end of 2005 was a sensation, and Rybka soon became the dominating program leading rating lists by a huge margin ^[11] ^[12] . Rybka 3 was developed in collaboration with Larry Kaufman, the most recent and strongest version Rybka 4 and the parallel version Deep Rybka 4 appeared in April 2010, market as standalone chess engine from RybkaChess.com ^[13] , from ChessOK optional with the Aquarium GUI ^[14] , or from ChessBase packaged with the Fritz GUI ^[15] . The demo version Rybka 2.3.2a can be downloaded for free ^[16] .

Achievements

^[17]

Year	Tournament	Rank/From	Title/Remarks
2004	CCT6	50/54
2005	IPCCC 2005 b	1/12
2006	CCT8	1/38
	ICT 2006	1
	WCCC 2006	3/18	as Rajlich, disqualified 2011
	DOCCC 2006	1
	IPCCC 2006	1/10
2007	ACCA 2007	1/16
	CCT9	1/54
	ICT 2007	1
	WCCC 2007	1/12	World Computer Chess Champion, disqualified 2011
	DOCCC 2007	1/14
	IPCCC 2007	2/10
2008	ACCA 2008	1/18
	ICT 2008	1
	WCCC 2008	1/10	World Computer Chess Champion, disqualified 2011
	DOCCC 2008	1/10
2009	ACCA 2009	1/12
	WCCC 2009	1/10	World Computer Chess Champion, disqualified 2011
	DOCCC 2009	1/9
2010	ICT 2010	1/14
	WCCC 2010	1/10	World Computer Chess Champion, disqualified 2011
	DOCCC 2010	1/20
2012	ICT 2012	1/8

Program Internals

Rybka is a bitboard engine, first versions rotated, Rybka 4 apparently magic bitboards for sliding piece attack and move generation. Vasik once posted a snippet of Rybka source-code, a typical bitboard serialization loop to generate white knight captures ^[18] .

for (bb_t knights = Board.pieces [WN]; knights; knights &= knights-1)
{
    int knight_sq = bit_scan (knights);
    for (bb_t captures = knight_moves [knight_sq] & opponent_pieces; captures; captures &= captures - 1)
    {
        int capture_sq = bit_scan (captures);
        *moves ++ = move (knight_sq, capture_sq);
        *values++ = Board.sq [capture_sq] * 256 + 192;
    }
}

Due to the disputed open source engines Strelka 2.0 and later Ippolit, which accordant to Vasik Rajlich were both based on or heavily influenced by re-engineered Rybka executables ^[19] ^[20] , other implementation details were released to the public, such as material- and material imbalance tables, aggressive LMR, razoring ^[21] and some variation of singular extensions ^[22] . Zach Wegner elaborated on evaluation issues, and compared Rybka 1 beta with Fruit's evaluation ^[23] ^[24] , continued by former anonymous author "BB+" alias Mark Watkins in February 2011 ^[25] .

Release Dates

Rybka 1.0 beta : 2005-12
Rybka 1.0 :
Rybka 1.1 : 2006-04
Rybka 1.2 : 2006-06
Rybka 1.5 :
Rybka 1.6.1 :
Rybka 2.0 :
Rybka 2.2 : 2006
Rybka 2.2n2 : 2006-12
Rybka 2.3 : 2007-01
Rybka 2.3.1 : 2007-02
Rybka 2.3.2a : 2007-06
Rybka 3 : 2008-08
Rybka 4 : 2010-05
Rybka 4.1 : 2011-3

Controversies

Rybka 1.0 and Fruit

Rajlich's interpretation of nodes and depth ^[26] ^[27] ^[28] ^[29] ^[30] , and the controversy about Strelka ^[31] ^[32] raised suspicions about the initial origin of Rybka 1.0 ^[33] ^[34] , but Vasik Rajlich categorically denied Rybka 1.0 was based on Fruit ^[35] ^[36] , as mentioned by Chrilly Donninger in 2005 ^[37] after early rumors ^[38] and questions ^[39] arose.

Vasik Rajlich's most quoted statement in these discussions was probably from an interview in uciengines.de, December 20, 2005 ^[40] :

Yes, the publication of Fruit 2.1 was huge. Look at how many engines took a massive jump in its wake: Rybka, Hiarcs, Fritz, Zappa, Spike, List, and so on. I went through the Fruit 2.1 source code forwards and backwards and took many things.
...
Anyway, if I really had to give a number - my wild guess is that Rybka would be 20 rating points weaker had Fruit not appeared.

Ippolit

The appearance of the Ippolit open source program by pseudonymous authors in May 2009, and Rajlich's claim it is a clone of Rybka 3 ^[41] without any substantiation and evidence, caused further discussions ^[42] .

Open Letters

In January 2011, Fabien Letouzey confirmed that Strelka, the allegedly clone of Rybka, was not a verbatim copy of the source code from Fruit, but a bitboard re-write of Fruit with some other ideas, and not just an extraction of a couple of ideas ^[43] ^[44] ^[45] .

On February 19, 2011 ICGA president David Levy broached on cloning issues in a ChessVibes column ^[46] . In March 2011, following computer chess programmers signed an open letter to David Levy, Jaap van den Herik and the board of the ICGA, to support the claim Rybka 1.0 beta and subsequent versions were allegedly derivatives from Fabien Letouzey’s program Fruit 2.1:

The letter was published in the private ICGA Investigations Wiki ^[49] and elsewhere ^[50] ^[51] ^[52] . The German sites Heise online ^[53] and Spiegel Online broached the issue ^[54] .

Pre-Beta Rybka and Crafty

In February and March 2011, evidence was found by Zach Wegner and Mark Watkins that pre-Beta Rybka, which played the CCT6 in January 2004, and competed in tournaments of Engine Rating Lists such as ChessWar ^[55] ^[56] and Le Fou numérique ^[57] , contain a substantial amount of Crafty code ^[58] , confirmed by Robert Hyatt ^[59] ^[60] . Beside other evidence there are the known bugs in the old Crafty code (if ms == 99999) ^[61] that caused El Chinito by primary author Eugenio Castillo Jiménez to be exposed as a clone ^[62] ^[63] .

Disqualification

In June 2011, the ICGA has disqualified and banned Rybka and its programmer Vasik Rajlich from previous and future World Computer Chess Championships. The ICGA accuses Rajlich of plagiarizing two other programs, Crafty and Fruit, and demands that he returns the trophies and prize money of the World Computer Chess Championships in 2007, 2008, 2009 and 2010 ^[64] .

In August 2011, the board of the Dutch Computer Chess Federation (CSVN) declared the most serious doubts as to the rightfulness of ICGA's decision. Therefore, they have chosen not to abide by their sanctions against Rybka ^[65] , see ICGA Investigations

Publications

Jeroen Noomen, Jos Uiterwijk, Jaap van den Herik (2007). The 15th World Computer Chess Championship. ICGA Journal, Vol. 30, No. 2 » WCCC 2007
Matej Guid, Ivan Bratko (2007). Factors affecting diminishing returns for searching deeper. CGW 2007 » Crafty, Rybka, Shredder, Diminishing Returns
Matej Guid, Ivan Bratko (2007). Factors affecting diminishing returns for searching deeper. ICGA Journal, Vol. 30, No. 2, pdf
Hans Secelle. Eric van Reem (2007). Golden Summer for RYBKA. ICGA Journal, Vol. 30, No. 3
Mark Watkins (2010). A comparison of Rybka and IPPOLIT. pdf ^[66] » Ippolit
Mark Watkins (2011). A comparison of Rybka 1.0 Beta and Fruit 2.1, pdf, February 12, 2011 Version ^[67]
Mark Watkins (2011). A comparison of Rybka 1.0 Beta and Fruit 2.1, pdf, February 24, 2011 Version
Mark Watkins (2011). A comparison of Rybka 1.0 Beta and Fruit 2.1, pdf, March 11, 2011 Version » Fruit
Anthony Cozzie (2011). The Future of Computer Chess. Selective Search 154, pp. 11, pdf hosted by Mike Watters
Jaap van den Herik, Krzysztof Siewicz (2011). Open Source has a Price. ICGA Journal, Vol. 34, No. 2
David Levy (2011). Rybka Disqualified and Banned from World Computer Chess Championships.ICGA Journal, Vol. 34, No. 2
David Levy (2011). A Very Sad Case. ICGA Journal, Vol. 34, No. 2
Mark Lefler, Robert Hyatt, Harvey Williamson, ICGA panel (2011). Rybka Investigations and Survey of Findings for the ICGA. ICGA Journal, Vol. 34, No. 2
Eric Hallsworth (2011). Rybka disqualified and banned by ICGA from World Computer Chess Championships, Lifetime Ban for Vasik Rajlich. Selective Search 155, pp. 8, pdf hosted by Mike Watters
Mark Watkins (2011). Review of the Rybka case. pdf from OpenChess Forum ^[68]
Søren Riis (2012). A Gross Miscarriage of Justice in Computer Chess. pdf hosted by ChessBase
Arno Nickel (2012). Die schöne neue Welt der Schachengines. SCHACH 2,3,5,6 2012, pdf (German) ^[69]
Ed Schröder (2012). Rybka reloaded. pdf
Matej Guid, Ivan Bratko (2012). Detecting Fortresses in Chess. Elektrotehniški vestnik, Vol. 79, Nos. 1-2, pdf » Houdini
Mark Watkins (2013). Review of the Rybka case. pdf
Søren Riis (2014). What makes a chess program original? Revisiting the Rybka case. Entertainment Computing, Vol. 5, No. 3
Don Dailey, Adam Hair, Mark Watkins (2014). Move Similarity Analysis in Chess Programs. Entertainment Computing, Vol. 5, No. 3, preprint as pdf ^[70]
David Levy (2014). The RYBKA Case – Progress and Verdict. ICGA Journal, Vol. 37, No. 4 » Rybka Controversy

Forum Posts

2004

Re: CCT6: Rybka /Bodo ??? by Vasik Rajlich, CCC, January 27, 2004

2005

Rybka 1.0 beta release - need testers by Vasik Rajlich, CCC, November 30, 2005
Rybka 1.0 Announcement by Vasik Rajlich, CCC, December 05, 2005
Is Rybbka a fruit clone? by Ziad Haddad, CCC, December 06, 2005
Rybka - How much Fruit is inside? by Daniel Mehrmann, CCC, December 11, 2005
Rybka test position by K. Burcham, CCC, December 11, 2005 » Ktulu
Rybka uses PVS and not MTD(f). Its no Fruit-Clone by Chrilly Donninger, CCC, December 12, 2005
The Code for the Rybka-Mate-Bug by Chrilly Donninger, CCC, December 13, 2005
Unmasking the Secrets of Rybka and Fruit by Stuart Cracraft, CCC, December 15, 2005
Secrets of Rybka and Fruit from my point of view by Sergei S. Markoff, CCC, December 15, 2005
Spike-Rybka by Vasik Rajlich, CCC, December 28, 2005 » IPCCC 2005 b
The man behind Rybka and his thoughts as posted here on CCC by Mike Byrne, CCC, December 31, 2005

2006

Rybka and Fruit on Chessbase by Walter Faxon, CCC, January 14, 2006 » Fruit, ChessBase
The superior Rybka chess knowledge by Chrilly Donninger, CCC, January 18, 2006
Rybka's NPS - one presumption by Vladan Vučković, CCC, February 16, 2006 » Nodes per second
Rybka @ CCT8 by Vasik Rajlich, CCC, February 26, 2006

2007

outlook and plans for Rybka 3 by Vasik Rajlich, Rybka Forum, January 09, 2007
Rybka 2.3 release date now Monday February 12 by Vasik Rajlich, Rybka Forum, February 04, 2007
Rybka 2.3 readme by Vasik Rajlich, Rybka Forum, February 13, 2007
Rybka @ Leiden ICT7 by Vasik Rajlich, Rybka Forum, May 20, 2007
Open Letter and $100,000 Challenge to FIDE by Vasik Rajlich, Rybka Forum, May 31, 2007
How secure is the source code of Rybka? by SR, Rybka Forum, June 05, 2007
Rybka 2.3.2a readme by Vasik Rajlich, Rybka Forum, June 18, 2007
Rybka @ Amsterdam 15th WCCC by Vasik Rajlich, Rybka Forum, June 19, 2007
Strelka = Rybka 1.0 by DarkAvenger, Rybka Forum, July 07, 2007 » Strelka
What Strelka tells about Rybka's nodecount and depth by Ernest Bonnem, CCC, July 09, 2007
Longer comments by V. Rajlich by Marc Lacrosse, CCC, July 10, 2007
Re: Is Rybka a derivative of Fruit? by Vasik Rajlich, Rybka Forum, July 14, 2007
Fruit, Rybka, Strelka final conclusion! (I hope) by Michael Sherwin, CCC, July 13, 2007
Rybka vs Zappa in Mexico City by Vasik Rajlich, Rybka Forum, September 28, 2007
Rybka @ Leiden 27th Dutch CCC by Vasik Rajlich, Rybka Forum, October 29, 2007

2008

Strelka 2.0 by Vasik Rajlich, Rybka Forum, January 11, 2008 » Strelka
Re: Strelka 2.0 pg 4 by Anthony Cozzie, Rybka Forum, January 11, 2008
Rajlich/Osipov/Rybka/Strelka/Answers by Convekta by Eduard Nemeth, CCC, January 17, 2008 » Strelka, Convekta
Anthony Cozzie speak ! by Silvian, Rybka Forum, February 03, 2008 ^[71]
Rybka 3 with new GUI: are they serious?! by Jouni Uski, CCC, April 05, 2008 » Aquarium
Retry: Rybka 1.0 Beta Node Count Patch by Rick Fadden, CCC, April 19, 2008
Strelka Reverse Engineered from Rybka: Details Examined by Rick Fadden, CCC, May 01, 2008
Rybka @ Leiden 8th ICT by Vasik Rajlich, Rybka Forum, June 01, 2008
Rybka 3 -- a hundred elo! by Larry Kaufman, Rybka Forum, July 08, 2008
Rybka 3 - some info by Vasik Rajlich, Rybka Forum, July 19, 2008
Rybka 3: The dark truth behind the hype by Albert Silver, CCC, July 25, 2008
Rybka 3 Release Notes by Vasik Rajlich, Rybka Forum, August 04, 2008
Rybka 3 FAQ by Vasik Rajlich, Rybka Forum, August 05, 2008
Rybka v2.2n2 download by Vasik Rajlich, Rybka Forum, August 06, 2008
Rybka 1.0 vs. Strelka by Zach Wegner, CCC, August 19, 2008
Questions for Vas by Zach Wegner, CCC, August 25, 2008
A very simple question to Vas that can end it all by Christophe Théron, CCC, August 25, 2008
Rybka questions and answers by Chris Whittington, CCC, August 25, 2008
question to vas on similarity of rybka 1.0 to fruit by duncan, Rybka Forum, August 25, 2008
split 3 from Zach technical thread by Christophe Théron, CCC, August 27, 2008
My two cents by Anthony Cozzie, CCC, August 27, 2008
To campaign or not by Ed Schroder, CCC, August 28, 2008
How a court detects a derivative work by Christophe Théron, CCC, August 30, 2008
Is It Me or is the Source Comparison Page Rigged? by RegicideX, CCC, September 01, 2008 ^[72] ^[73]
Plagiarism and Rybka by Enrique Irazoqui, CCC, September 03, 2008
Rybka @ 16th WCCC in Beijing by Vasik Rajlich, Rybka Forum, October 04, 2008
Strelka = Rybka 1.0 =Fruit 2.1 = Toga?? Oh how disappointing by Oliver Brausch, CCC, October 21, 2008
Rybka @ 28th Dutch CCC by Vasik Rajlich, Rybka Forum, November 18, 2008

2009

Rybka @ Pamplona 17th ICGA World Computer Chess Championship by Vasik Rajlich from Rybka Forum, May 17, 2009 » WCCC 2009
Rybka @ 29th Open Dutch Computer Chess Championship by Vasik Rajlich, Rybka Forum, October 19, 2009 » DOCCC 2009
Official statement on [Deleted]? by Vasik Rajlich, Rybka Forum, October 21, 2009

2010

Rybka 4 update by Vasik Rajlich, Rybka Forum, April 11, 2010
Rybka 4 is final. (select games for fun) by Albert Silver, CCC, May 25, 2010
Rybka 4 Release Notes by Vasik Rajlich, Rybka Forum, May 26, 2010
ICT Leiden 2010: Rybka wins with 8/9. Opening report by Jeroen Noomen, Rybka Forum, May 30, 2010 » ICT 2010
Rybka @ 10th ICT Leiden 2010 by Vasik Rajlich, Rybka Forum, May 31, 2010 » ICT 2010
BB's Rybka/Ippolit comparison by Zach Wegner, OpenChess Forum, June 13, 2010
Deep Blue vs Rybka by Don Dailey, CCC, September 13, 2010
Kanazawa Diary (Rybka operator in Japan) by Hans van der Zijden, Rybka Forum, September 24, 2010 » WCCC 2010
WCCC 2010 in Kanzawa, Japan by Vasik Rajlich, Rybka Forum, October 2, 2010 » WCCC 2010
Rybka @ 30th Dutch Computer Chess Championship by Vasik Rajlich, Rybka Forum, November 16, 2010 » DOCCC 2010
Brief Q&A about Rybka 1.0 Beta and Fruit 2.1 by BB+, OpenChess Forum, December 14, 2010
Rybka Cluster Rental Program by Vasik Rajlich, Rybka Forum, December 30, 2010

2011

Node counting by BB+, OpenChess Forum, January 20, 2011 » Node
Fabien's open letter to the community by Tord Romstad, CCC, January 23, 2011
Fabien's open letter to the community by Tord Romstad, OpenChess Forum, January 23, 2011
Revisiting Strelka/Rybka by BB+, OpenChess Forum, January 25, 2011
Feb 12 version: Rybka 1.0 Beta / Fruit 2.1 document by BB+, OpenChess Forum, February 12, 2011
Attack of the clones | ChessVibes by David Levy, 19 February, 2011
Programmers write open letter about Rybka-Fruit issue | ChessVibes by Peter Doggers, March 01, 2011
Open letter to the ICGA about the Rybka-Fruit issue by Harvey Williamson, Hiarcs Forum, March 01, 2011
Programmers Open Letter to ICGA on Rybka/Fruit by BB+, OpenChess Forum, March 01, 2011
Rybka 1.6.1 by Robert Hyatt, Rybka Forum, March 13, 2011
Longer Article by Anthony Cozzie, CCC, March 17, 2011
History of eval changes in Rybka versions byBB+, OpenChess Forum, March 23, 2011
Rybka disqualified and banned from World Computer Chess Cham by Tim Chan, CCC, June 29, 2011
Rybka disqualified and banned from World Computer Chess Cham by TheHug, Rybka Forum, June 29, 2011
Rybka disqualified and banned from WCCC by Harvey Williamson, Hiarcs Forum, June 29, 2011
Rybka disqualified and banned from WCCC by Jeremy Bernstein, OpenChess Forum, June 29, 2011
Rybka ban thoughts by Dann Corbit, CCC, June 29, 2011
My two cents on Rybka's disqualification by Joona Kiiski, CCC, June 30, 2011
Dismissed with prejudice by Dann Corbit, CCC, July 01, 2011
Voir Dire by Dann Corbit, CCC, July 01, 2011 ^[74]
Vas say something by siam, Rybka Forum, July 01, 2011
The ICGA Process by BB+, OpenChess Forum, July 01, 2011
Progess (often) is ugly, a summary try by Rebel, OpenChess Forum, July 03, 2011
Is Rybka that needs ICGA or the opposite ? by Marco Costalba, CCC, July 03, 2011
The Intellectual Property Oxymoron by Gary Belton, CCC, July 03, 2011
The Evidence against Rybka by BB+, OpenChess Forum, July 04, 2011
Why did the ICGA ignore this advice? by John Sidles, Rybka Forum, July 06, 2011
Minority Report Plagiarism - Quantifying Evaluation Features by Trotsky, Rybka Forum, July 09, 2011
Back to R3/IPPOLIT(/R4?) by BB+, OpenChess Forum, July 14, 2011
In retrospect by Rebel, Rybka Forum, July 14, 2011
Minority Report 2 - Unravelling the technical report by Trotsky, Rybka Forum, July 22, 2011
Minority Report 3, PST + other lookup tables are they legal? by Trotsky, Rybka Forum, July 25, 2011
On Rybka/Crafty and licensing/copyright by BB+, OpenChess Forum, July 28, 2011
Thoughts on Fruit=Rybka EVAL by Rebel, OpenChess Forum, August 16, 2011
Apology to Vas by Rebel, Rybka Forum, August 17, 2011

2012

Rybka evidence recapitulation by BB+, OpenChess Forum, January 03, 2012
A Big Thanks and a Small Update by Vasik Rajlich, Rybka Forum, January 08, 2012
Fruit/Rybka timeline by BB+, OpenChess Forum, January 09, 2012
Rybka 1.0 source code by Ed Schröder, CCC, January 31, 2012 ^[75]

External Links

Rybka

Rybka from Wikipedia
Rybka (disambiguation) from Wikipedia
Rybka's ICGA Tournaments
Welcome to RybkaChess.com!
Rybka Chess Community Forum
Rybka Cluster - for the elite chess player
Interview with Vasik Rajlich by Christopher Conkie, Michael Diosi, Frank Quisinsky & Alexander Schmidt, December 20, 2005, hosted by Ed Schröder
ChessAssistance.com Rybka Review by Robert Pawlak, September 23, 2006
Interview with IM Vasik Rajlich, author of Rybka chess program Written by content team 24 July 2007 from LatestChess.com
Rybka Explained? by John L. Jerz
Does Rybka Properly Count Positions Evaluated? by John L. Jerz
The chess program Rybka as a Rational Agent by John L. Jerz
Rybka 3.0 – Not just the strongest chess program in the world, July 18, 2008, ChessBase News
Anthony Cozzie speaks about Rybka source code from Steve Lim / SuperSteve3d - Home, February 04, 2008 » Anthony Cozzie, Strelka ^[76]
Rybka's Monte Carlo analysis by Steve Lopez, ChessBase News, February 03, 2009
Rybka doch nicht unbesiegbar, Neues Deutschland, June 26, 2010 (German)

Controversy

Attack of the clones | ChessVibes by David Levy, 19 February, 2011
Schach-Software Rybka - Programmierer vermuten Intelligenzklau by Frank Patalong, Spiegel Online, March 03, 2011 (German)
Plagiatsvorwurf gegen Computerschach-Weltmeister, Heise online, March 01, 2011 (German)
Rybka disqualified and banned from World Computer Chess Championships | ChessVibes by Peter Doggers, June 29, 2011
Susan Polgar Chess Daily News and Information: Breaking News! Rybka banned!, June 29, 2011
Rybka disqualified and banned from World Computer Chess Championships - Chess Weekly
Rybka banned by International Games Federation – Rybka Ruling
Rybka, the world’s best chess engine, outlawed and disqualified | ExtremeTech by Sebastian Anthony on June 29, 2011
Computer chess champ stripped of its four titles by Claire Courchane, Washington Times, June 30, 2011
Rybka Disqualified, Banned On Plagiarism Charges | ITProPortal.com by Ravi Mandalia, June 30, 2011
Boylston Chess Club Weblog: Rybka banned from computer champs; stripped of all its titles, June 30, 2011
Computer chess reels from 'biggest sporting scandal since Ben Johnson' | Metro.co.uk by Tariq Tahir, June 30th, 2011
Schachcomputer-Weltmeister nachträglich disqualifiziert, Heise online, June 30, 2011 (German)
Weltmeisterprogramm Rybka verliert alle Titel by Frank Patalong, Spiegel Online, July 01, 2011 (German)
Developer of Computer Chess Champ Accused of Stealing Code by Dylan Loeb McClain, NYTimes.com, July 2, 2011
Geklontes Fischchen by Stefan Löffler, July 08, 2011, DiePresse.com (German)
Rybka and the ICGA, CSVN Computerschaak
Rybka vs ICGA a different view by Ed Schröder, November 09, 2011
Rybka evidence by Ed Schröder, November 09, 2011
A Gross Miscarriage of Justice in Computer Chess (part one) by Søren Riis, ChessBase News, January 02, 2012 ^[77] ^[78] ^[79]
A Gross Miscarriage of Justice in Computer Chess (part two) by Søren Riis, ChessBase News, January 03, 2012 ^[80]
A Gross Miscarriage of Justice in Computer Chess (part three) by Søren Riis, ChessBase News, January 04, 2012
A Gross Miscarriage of Justice in Computer Chess (part four) by Søren Riis, ChessBase News, January 05, 2012 ^[81]
Controversy over Rybka's disqualification and ban (UPDATE) | ChessVibes by Peter Doggers, January 08, 2012
ICGA/Rybka controversy: An interview with David Levy (1), ChessBase News, February 06, 2012
ICGA/Rybka controversy: An interview with David Levy (2), ChessBase News, February 10, 2012
ICGA/Rybka controversy: Feedback, ChessBase News, February 17, 2012

References

^ Bulletin Day 7 WCCC 2007 (ICGA Tournaments)
^
- Rybka disqualified and banned from World Computer Chess Championships | ChessVibes by Peter Doggers, June 29, 2011
^ Rybka - for the serious chess player - Purchase Rybka
^ Rybka 4 is here – and stronger than ever, ChessBase News, May 31, 2010
^ ChessOK, Chess Shop from the Developers of Rybka 3 Aquarium
^ Rybka - for the serious chess player - Rybka team
^ Rybka 1.0 beta release - need testers by Vasik Rajlich, CCC, November 30, 2005
^ Rybka Beta 1.0 - Chess.com
^ New Chess Engine - Rybka v 1.0 Beta Readme, Dec 4, 2005
^ Rybka 1.0 Announcement by Vasik Rajlich, CCC, December 05, 2005
^ The SSDF Rating List
^ CEGT Quad Versions 40/120 (AMD 3500+/4200+)
^ Rybka - for the serious chess player - Purchase Rybka
^ Rybka & Aquarium - ChessOK shop
^ Chess software - Rybka 4 from ChessBase
^ Rybka - for the serious chess player - Download Rybka 2.3.2a
^ Rybka disqualified and banned from World Computer Chess Championships | ChessVibes by Peter Doggers, June 29, 2011
^ re: rybka source code by Vasik Rajlich, Rybka Forum, July 24, 2007
^ Strelka 2.0 by Vasik Rajlich, Rybka Forum, January 11, 2008
^ My recent correspondence with Vasik Rajlich by Sven Schüle, CCC, June 13, 2010
^ Re: Strelka 2.0 pg 4 by Anthony Cozzie, Rybka Forum, January 11, 2008
^ A question to Larry Kaufman, by Erik, Rybka Forum, December 30/31, 2009
^ Rybka/Fruit: evaluation by Zach Wegner
^ Re: What do you folks make of this ? by Chris Whittington, OpenChess Forum, June 27, 2010
^ Mark Watkins (2011). A comparison of Rybka 1.0 Beta and Fruit 2.1, pdf, February 24, 2011 Version
^ What Strelka tells about Rybka's nodecount and depth by Ernest Bonnem, CCC, July 09, 2007
^ Does Rybka Properly Count Positions Evaluated? by John L. Jerz
^ To Jeroen and interested minds, re. Tiger node count by Christophe Théron, CCC, August 15, 2008
^ Re: Question to Larry Kaufman about Rybka by Larry Kaufman, CCC, February 05, 2010
^ Node counting by BB+, OpenChess Forum, January 20, 2011
^ Strelka = Rybka 1.0 by DarkAvenger, Rybka Forum, July 07, 2007
^ Strelka 2.0 by Vasik Rajlich, Rybka Forum, January 11, 2008
^ Rybka 1.0 vs. Strelka by Zach Wegner, CCC, August 19, 2008
^ Questions for Vas by Zach Wegner, CCC, August 25, 2008
^ Re: Is Rybka a derivative of Fruit? by Vasik Rajlich, Rybka Forum, July 14, 2007
^ question to vas on similarity of rybka 1.0 to fruit by duncan, Rybka Forum, August 25, 2008
^ Rybka uses PVS and not MTD(f). Its no Fruit-Clone by Chrilly Donninger, CCC, December 12, 2005
^ Is Rybbka a fruit clone? by Ziad Haddad, CCC, December 06, 2005
^ Rybka - How much Fruit is inside? by Daniel Mehrmann, CCC, December 11, 2005
^ Interview with Vasik Rajlich by Christopher Conkie, Michael Diosi, Frank Quisinsky & Alexander Schmidt, December 20, 2005, hosted by Ed Schröder
^ Official statement on [Deleted]? by Vasik Rajlich, Rybka Forum, October 21, 2009
^ I'm in doubt if RobboLito is a clone by Volker Pittlik, CCC, October 24, 2009
^ Fabien's open letter to the community by Tord Romstad, CCC, January 23, 2011
^ Fabien's open letter to the community by Tord Romstad, OpenChess Forum, January 23, 2011
^ The Chess Mind Blog - More Computer Chess Controversy
^ Attack of the clones | ChessVibes by David Levy, 19 February, 2011
^ In retrospect by Rebel, Rybka Forum, July 14, 2011
^ Apology to Vas by Rebel, Rybka Forum, August 17, 2011
^ ICGA Investigations Wiki
^ Programmers write open letter about Rybka-Fruit issue : ChessVibes by Peter Doggers, March 01, 2011
^ Open letter to the ICGA about the Rybka-Fruit issue by Harvey Williamson, Hiarcs Forum, March 01, 2011
^ Programmers Open Letter to ICGA on Rybka/Fruit by BB+, OpenChess Forum, March 01, 2011
^ Plagiatsvorwurf gegen Computerschach-Weltmeister, Heise online, March 01, 2011 (German)
^ Schach-Software Rybka - Programmierer vermuten Intelligenzklau by Frank Patalong, Spiegel Online, March 03, 2011 (German)
^ RYBKA 1.6.1 in Chess War V-VII
^ Re: Programmers Open Letter to ICGA on Rybka/Fruit by Olivier Deville, Openchess Forum, March 05, 2011
^ Le Fou numérique - Le Système du Suisse 3 - T
^ Re: Programmers Open Letter to ICGA on Rybka/Fruit by BB+, OpenChess Forum, March 05, 2011
^ Re: Programmers Open Letter to ICGA on Rybka/Fruit by Robert Hyatt, Openchess Forum, March 05, 2011
^ Rybka 1.6.1 by Robert Hyatt, Rybka Forum, March 13, 2011
^ Re: Programmers Open Letter to ICGA on Rybka/Fruit byBB+, OpenChess Forum, March 04, 2011
^ Re: Correction: List and ElChinito as Crafty clones, ... etc by Paul H, CCC, August 21, 2004
^ Open letter by Eugenio Castillo (ELChinito team) ... by Frank Quisinsky, CCC, August 28, 2004
^ Rybka disqualified and banned from World Computer Chess Championships | ChessVibes by Peter Doggers, June 29, 2011
^ Rybka and the ICGA, CSVN Computerschaak
^ BB's Rybka/Ippolit comparison by Zach Wegner, OpenChess Forum, June 13, 2010
^ Feb 12 version: Rybka 1.0 Beta / Fruit 2.1 document by BB+, OpenChess Forum, February 12, 2011
^ Rybka evidence recapitulation by BB+, OpenChess Forum, January 03, 2012
^ Part 1 covers Houdini, Rybka, Komodo, Stockfish, Critter, Naum, Chiron and Spike
^ A Pairwise Comparison of Chess Engine Move Selections by Adam Hair, hosted by Ed Schröder
^ Anthony Cozzie speaks about Rybka source code from Steve Lim / SuperSteve3d - Home, February 04, 2008
^ Why did the ICGA ignore this advice? by John Sidles, Rybka Forum, July 06, 2011
^ Re: A Big Thanks and a Small Update by John Sidles, Rybka Forum, January, 08, 2012
^ Voir dire from Wikipedia
^ Fruit 2.1 and Rybka 1.0 Beta 1.0 decompiled source code by Ed Schröder
^ Anthony Cozzie speak ! by Silvian, Rybka Forum, February 03, 2008
^ ChessBase: A Gross Miscarriage of Justice in Computer Chess by kingliveson, OpenChess Forum, January 02, 2012
^ Re: ChessBase: A Gross Miscarriage of Justice in Computer Chess by BB+, OpenChess Forum, January 02, 2012
^ Re: Hyatt Is Gone! by BB+ OpenChess Forum, Jan 03, 2012
^ Rybka evidence recapitulation by BB+, OpenChess Forum, January 03, 2012
^ Søren Riis (2012). A Gross Miscarriage of Justice in Computer Chess. pdf hosted by ChessBase

What links here?

Page	Date Edited
14th Computer Olympiad	Jul 23, 2017
ACCA 2007	Jul 14, 2014
ACCA 2008	Jul 14, 2014
ACCA 2009	Jul 14, 2014
ACCA Americas' Computer Chess Championship	Nov 20, 2014
ACCA World Computer Rapid Chess Championship	Jun 27, 2017
Albert Silver	Feb 25, 2018
Alessandro Scotti	Feb 27, 2014
Alexander Schmidt	May 17, 2016
Almond	Feb 14, 2012
Alon Greenfeld	Feb 24, 2017
Anthony Cozzie	Nov 5, 2016
Aquarium	Dec 4, 2016
Argonaut	Apr 15, 2013
Arno Nickel	Sep 25, 2015
Bodo	Oct 6, 2016
Bright	Oct 25, 2016
BugChess FR	Feb 24, 2013
CCT Tournaments	Jan 29, 2017
CCT10	May 5, 2013
CCT11	Feb 17, 2015
CCT6	May 29, 2014
CCT8	Apr 6, 2013
CCT9	Aug 25, 2013
CGW 2007	Jan 2, 2017
Chaturanga IT	Jan 7, 2016
Checkmate	Apr 13, 2018
Chess	Jan 21, 2018
Chess Assistant	Jul 16, 2017
Chess960CWC 2007	Aug 21, 2012
Chess960CWC 2008	Aug 21, 2012
Chess960CWC 2009	Aug 21, 2012
ChessBase	Nov 25, 2017
ChessOK	Jul 30, 2013
Chiron	Sep 24, 2017
Chris Whittington	Dec 9, 2017
Claims of Rybka Originality	May 17, 2016
Claims that Strelka is Rybka	Jun 6, 2012
Clones	Jan 16, 2017
Computer Chess Forums	Nov 26, 2017
Computer Olympiad	Mar 6, 2018
Crafty	Jan 28, 2018
Critter	Jan 25, 2014
Daniel Mehrmann	Dec 13, 2015
Dann Corbit	Dec 9, 2017
David Levy	Jan 3, 2017
Deep Fritz versus Deep Junior 2007	Oct 15, 2016
Deep Sjeng	Jan 7, 2016
Depth	Feb 25, 2018
DOCCC 2006	Aug 27, 2016
DOCCC 2007	Aug 15, 2015
DOCCC 2008	Aug 15, 2015
DOCCC 2009	Aug 15, 2015
DOCCC 2010	Aug 15, 2015
DOCCC 2011	Dec 1, 2013
Dutch Open Computer Chess Championship	Sep 25, 2014
Ed Schroder	Feb 26, 2018
Eduard Nemeth	Nov 22, 2014
Eigenmann Endgame Test	Jun 1, 2017
Engines	Mar 10, 2018
Eric van Reem	Sep 10, 2014
Ernest Bonnem	Jan 26, 2014
Fabien Rybka Letter	Feb 23, 2014
Fortress	Feb 1, 2018
Fritz	Feb 26, 2018
Fritz Reul	Nov 28, 2016
Fruit	Sep 27, 2016
GullChess	Jun 27, 2017
Hans Secelle	Nov 2, 2012
Hans van der Zijden	Dec 13, 2016
Harry Schnapp	Apr 11, 2013
Helmut Weigel	Dec 2, 2017
Hiarcs	Feb 25, 2018
Houdini	Apr 14, 2018
ICGA Journal	Dec 21, 2017
ICT 2006	Oct 14, 2015
ICT 2007	Sep 14, 2015
ICT 2008	Sep 14, 2015
ICT 2010	Sep 14, 2015
ICT 2012	Jun 11, 2012
Ikarus	Jul 5, 2016
International CSVN Tournament	Jan 8, 2018
IPCCC	Jan 20, 2017
IPCCC 2005 b	Apr 15, 2013
IPCCC 2006	Dec 8, 2012
IPCCC 2007	May 30, 2016
Ippolit	May 17, 2016
Ivan Bratko	Aug 16, 2017
Iweta Rajlich	Sep 23, 2017
Jeroen Noomen	Jul 21, 2017
Joel Veness	Dec 8, 2017
John L. Jerz	Jul 15, 2013
Jury Osipov	Jul 29, 2013
Kai Laskos	Jan 21, 2018
Karlo Bala Jr.	Feb 19, 2017
Knowledge	Jul 22, 2017
Komodo	Mar 6, 2018
Kramnik versus Deep Fritz 2006	Nov 28, 2017
Krzysztof Siewicz	Aug 9, 2014
Ktulu	May 16, 2015
Lance Perkins	Nov 10, 2011
Larry Kaufman	Jan 28, 2018
LearningLemming	Jun 29, 2013
Livingston Chess960 Computer World Championship	Aug 7, 2012
Loop (Program)	Mar 14, 2017
Marco Costalba	Feb 28, 2018
Mark Watkins	Dec 6, 2017
Martin Thoresen	Apr 29, 2015
Match Statistics	Mar 31, 2018
Matej Guid	Jan 6, 2018
Material Tables	May 5, 2017
Michael Sherwin	Dec 18, 2017
Milos Stanisavljevic	May 23, 2016
Monte-Carlo Tree Search	Apr 26, 2018
Naum	Nov 23, 2017
Nelson Hernandez	Nov 23, 2017
Node	Jul 20, 2015
Nodes per second	Feb 28, 2018
Norman Schmidt	Oct 12, 2017
Olivier Deville	Sep 29, 2016
Parallel Search	Dec 30, 2017
Piece-Square Tables	Mar 31, 2018
Playing Strength	Mar 31, 2018
Quantifying Evaluation features	Jun 6, 2012
Revelation	Jul 15, 2016
Revelation II	Jan 8, 2018
Robert W. Howard	Jul 1, 2014
Rolf Tüschen	Jun 6, 2012
Rondo	Jan 7, 2016
Rook on Open File	Apr 24, 2017
Ross Boyd	Mar 12, 2018
Ryan Benitez	May 16, 2015
Rybka	Mar 27, 2017
Rybka Controversy	Jan 18, 2018
Scaramanga	Mar 6, 2011
Score	Apr 14, 2018
Sergei Markoff	Mar 12, 2018
Shredder	Jan 21, 2018
Silent but deadly	Jun 17, 2015
Singular Extensions	Jan 9, 2018
Spark	Oct 19, 2017
SpiderChess	Oct 4, 2017
Spike	Jan 7, 2016
Stephan Oliver Platz	Dec 14, 2017
Steve Lopez	Dec 4, 2016
Stockfish	Apr 7, 2018
Strelka	May 17, 2016
Sunfish	Jan 11, 2018
Sven Schüle	Sep 20, 2016
Søren Riis	Jan 10, 2017
Tarrasch	Apr 15, 2017
TCEC	Apr 18, 2018
TCEC Season 10	Jan 3, 2018
TCEC Season 5	Jun 2, 2014
TCEC Season 6	Dec 2, 2014
TCEC Season 9	Nov 6, 2017
Test-Positions	Feb 25, 2018
Thinker	Jan 7, 2016
TRACE	Feb 14, 2013
Vadim Demichev	Jul 26, 2013
Vasik Rajlich	Sep 23, 2017
Victor Zakharov	May 20, 2016
WCCC 2006	Jan 28, 2018
WCCC 2007	Jan 2, 2017
WCCC 2008	Jan 3, 2017
WCCC 2009	Apr 2, 2017
WCCC 2010	Jan 6, 2017
WCRCC 2007	Nov 21, 2016
WCRCC 2008	Nov 21, 2016
WCRCC 2009	Jul 14, 2014
WCRCC 2010	Jul 14, 2014
Wieland Belka	Jul 13, 2013
Windows	Nov 2, 2017
World Computer Chess Championship	Mar 6, 2018
Zach Wegner	Jan 7, 2016
Zappa	Oct 24, 2017
Zappa versus Rybka 2007	Nov 25, 2017
Đorđe Vidanović	Feb 20, 2017

Up one Level

Searcher

GerdIsenberg — Mon, 26 Sep 2016 15:25:31 GMT

Home * Engines * Searcher

		Searcher, a Chess Engine Communication Protocol compliant, private ^[1] chess engine written by Frank Phillips. It is a bitboard engine, although it didn't used Rotated Bitboards for move generation ^[2]. In 2008, Frank implemented Magic Bitboards, and started to rewrite and improve his "ancient code" ^[3].
Searcher (Bathymaster signatus) ^[4]

Tournament Play

Searcher played four consecutive, strong CCT Tournaments, the CCT3 (5th/32), CCT4 (6th/46), CCT5 (15th/45), and the CCT6 (12th/54).

Quotes

Frank Phillips in his CCT3 report on Searcher ^[5]:

My chess program (before then there was a knight tour, connect4, simple othello and others to learn recursion and search etc) started as my expanded interpretation of TSCP, helped by articles on the internet (particularly Marsland's excellent summary of the anatomy of a chess program) ^[6] and of course by members of CCC and particulalry Bob Hyatt. Now its origins are unrecognisable, although mailbox is still used to precompute move tables - simply because I had already written that code. The last major rewrite, two years or so ago introduced bitboards (because they looked interesting and Bob is always talking about them) to use mainly in evaluation. Move generation, king attacks, is a square attacked, SEE etc is a mixture of bitboards for the easy cases (knights, pawns, king) and offset precomputed arrays for the sliders. Like Dan Newman (I think), I also use bitboards to screen for _potential_ slider attacks etc to reduce work, but do not precompute the rank, file or diagonal states to give an index to a bitboard of the first square attacked. Full and rotated bitboards implementation next time. Maybe after an IQ transplant, or to get cheap mobility. Move generation is not a massive drain in my program, so bitboards are more valuable for their other benefits. Search is pretty standard Crafty type approach. Tried and discarded Dark Thought type pruning. But will try again after listening to Bruce on CCT3. Extensions as recommended by Bob and limited as recommend by Bruce, although I still have recapture extension because it seems to help me and do a bit extra for passed pawns. Tested other and other variations of extensions without much impact. All sorts of daft ideas. Trans/ref hash and hashing of basic pawn structure elements. Nalimov EGTBs (3 years to generate all 5 man on and off, on a variety of machines. Thanks Eugene), primitive book learning and positional learning. The evaluation has become increasingly sophisticated (voluminous anyway) with time. Playing on the chess servers, even for a brief time, has certainly caused me to add stuff.

Selected Games

CCT4, round 11, Searcher - Goliath-Blitz ^[7]

[Event "CCT4"]
[Site "Internet Chess Club"]
[Date "2002.01.27"]
[Round "11"]
[White "SearcherX"]
[Black "Goliath-Blitz"]
[Result "1-0"]
 
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 
8.O-O O-O 9.Be3 Be6 10.Nd5 Nxd5 11.exd5 Bf5 12.f4 e4 13.c3 Re8 14.Nd2 
h6 15.Bg4 Qc8 16.Bxf5 Qxf5 17.Qb3 Nd7 18.Qxb7 Reb8 19.Qc6 Rc8 20.Qa4 Nf6 
21.Bd4 Nxd5 22.Rae1 Bh4 23.g3 e3 24.Bxe3 Nxe3 25.Rxe3 Bf6 26.Ne4 Be7 
27.Nf2 Bf6 28.Rd1 Rab8 29.Re2 Rb6 30.Rdd2 g6 31.Qe4 Qd7 32.Qd5 Bg7 33.Ne4 
Rcc6 34.a4 Kh7 35.Rf2 f5 36.Nc5 Qc8 37.Ne6 Rb8 38.Rfe2 Qb7 39.Nxg7 Kxg7 
40.Re6 Rf8 41.Rxd6 Qb6+ 42.Kg2 Rxd6 43.Qxd6 Rf6 44.Qxb6 Rxb6 45.b4 Kf6 
46.Rd4 Ke6 47.Kf3 Rb7 48.Ke3 Rb8 49.Rc4 Kd6 50.Kd4 h5 51.Rc5 Kd7 52.Ra5 
Rb6 53.c4 Rxb4 54.Rxa6 Rb2 55.h4 Ra2 56.Rxg6 Ke7 57.Rg5 Ke6 58.Rxh5 Rxa4 
59.Rh6+ Ke7 60.h5 Ra3 61.Rg6 Ra2 1-0

Forum Posts

CCT3 Day 1 reflections by Frank Phillips, CCC, May 27, 2001 » CCT3
CCT3 day2 by Frank Phillips, CCC, May 28, 2001
A fun game between Searcher and PostModernist by Andrew Williams, CCC, July 14, 2001 » PostModernist
3 fold repetiton (Seacher v Postmodernist) by Frank Phillips, CCC, March 02, 2002 » Repetitions
Re: Simple questions about bitboards by Frank Phillips, CCC, September 22, 2003 » BitScan
Re: Speedup with bitboards on 64-bit CPUs by Frank Phillips, CCC, April 28, 2007
magic move - bitboard orientation by Frank Phillips, CCC, June 01, 2008 » Magic Bitboards
xboard and engine match using remote machine by Frank Phillips, CCC, September 18, 2011 » XBoard

External Links

SearcherX at ICC
Searcher (disambiguation) from Wikipedia
The Searchers (disambiguation) from Wikipedia
The Searchers (film) from Wikipedia
The Searchers - Umbrella Man (Liberty Records), YouTube Video

References

^ Private Engine List from Ron Murawski's Computer-Chess Wiki
^ Re: Simple questions about bitboards by Frank Phillips, CCC, September 22, 2003
^ magic move - bitboard orientation by Frank Phillips, CCC, June 01, 2008
^ Photo by Jan Haaga, from NOAA's Alaska Fisheries Science Center, Bathymaster signatus from Wikipedia
^ CCT3 day2 by Frank Phillips, CCC, May 28, 2001
^ Tony Marsland (1995). The Anatomy of Chess Programs. 8th World Computer Chess Championship pp. 4-6, pdf from The Computer History Museum, Courtesy of Monroe Newborn
^ PGN download from CCT4 hosted by Volker Richey

What links here?

Page	Date Edited
CCT3	Feb 14, 2013
CCT4	Apr 22, 2013
CCT5	Feb 22, 2013
CCT6	May 29, 2014
Engines	Mar 10, 2018
Frank Phillips	Sep 26, 2016
PostModernist	Jan 7, 2016
Searcher	Sep 26, 2016

Up one level

Shark NL

GerdIsenberg — Fri, 07 Aug 2015 20:50:46 GMT

Home * Engines * Shark

		Shark, a private chess engine by Sander de Zoete, which played the ICT 2002 and the DOCCC 2002 in Leiden. Shark's internal board is represented by a 0x88 array ^[1] .
The Great white shark is an Apex predator ^[2]

Photos & Games

^[3] ^[4]

Djenghis - Shark

DOCCC 2002: Visitor, Jan Kaan and Sander de Zoete, Djenghis - Shark

[Event "DOCCC 2002"]
[Site "Leiden NED"]
[Date "2002.10.20"]
[Round "05"]
[White "Djenghis"]
[Black "Shark"]
[Result "1/2-1/2"]
 
1.d4 d5 2.Nc3 Nf6 3.e4 Nxe4 4.Bb5+ Bd7 5.Bxd7+ Qxd7 6.Nxe4 dxe4
7.f3 exf3 8.Nxf3 Qe6+ 9.Kf2 Qb6 10.Rf1 g6 11.Kg1 c5 12.Be3 Bg7
13.dxc5 Qxb2 14.Rb1 Qxa2 15.Rxb7 Qa5 16.Rxe7+ Kxe7 17.Qd6+ Ke8
18.Bd2 Qa1 19.Qd5 Qxf1+ 20.Kxf1 Ke7 21.Qxa8 Nd7 22.Qxa7 Rc8 23.c4 Bf6
24.Bf4 Rxc5 25.Qa4 Rc8 26.Qb5 Ra8 27.Qd5 Ra1+ 28.Ke2 Ra2+ 29.Kf1 Ke8
30.g4 Ra6 31.Nd4 Ra1+ 32.Ke2 Ra2+ 33.Ke3 Be7 34.g5 Ra3+ 35.Ke4 Nc5+
1/2-1/2

Shark - IsiChess

DOCCC 2002, round 10, Shark - IsiChess ^[5]

[Event "DOCCC 2002"]
[Site "Leiden NED"]
[Date "2002.10.27"]
[Round "10"]
[White "Shark"]
[Black "IsiChess"]
[Result "0-1"]
 
1.e4 c5 2.Nf3 d6 3.Bc4 e6 4.O-O Nf6 5.Re1 Nc6 6.d3 Be7 7.Bb5 Bd7 8.a4 a6
9.Bc4 O-O 10.Na3 d5 11.Ba2 dxe4 12.dxe4 Nb4 13.e5 Ne8 14.Bb3 Bc6 15.Qe2 b5
16.Rd1 Qb6 17.c3 Nd5 18.Bc2 Nec7 19.Ng5 h6 20.Qd3 f5 21.exf6 Nxf6 22.Nh7 c4
23.Qg6 Ng4 24.Be3 Rxf2 25.Nf6+ Bxf6 26.Qh7+ Kf8 27.Bxb6 Rxg2+ 28.Kf1 Nxh2+ 
29.Ke1 Bh4+ 30.Bf2 Rxf2 31.Rd4 Nf3+ 32.Kd1 Nxd4 33.Nxc4 Rf1+ 34.Kd2 Nf3+ 
35.Ke2 Rxa1 36.Nd6 Re1+ 37.Kd3 Ne8 38.Qh8+ Ke7 39.axb5 axb5 40.Bb3 Bg5 
41.Ba4 Be4+ 42.Nxe4 Rd8+ 43.Kc2 bxa4 44.Qf8+ Kxf8 45.Nd6 Rxd6 46.b3 Rd2# 0-1

External Links

References

^ Reverse Bitboards by Sander de Zoete, CCC, January 13, 2003
^ A great white shark at Isla Guadalupe, Mexico. The picture is a digital copy of my old film picture, Shark from Wikipedia
^ 22nd Open Dutch Computer-Chess Championship 2002 - Photo Gallery, Photos by Theo van der Storm
^ Downloads | Open Dutch Computer Chess Championships | Games
^ Re: Reverse Bitboards by Sander de Zoete, CCC, January 14, 2003
^ Jaws - James Bond 007 Wiki

What links here?

Page	Date Edited
DOCCC 2002	Nov 24, 2017
Engines	Mar 10, 2018
ICT 2002	Nov 19, 2016
Praetorian	Feb 21, 2015
Sander de Zoete	Nov 2, 2013
Shark NL	Aug 7, 2015
Sharky	Jan 7, 2016

Up one Level

Sharky

GerdIsenberg — Thu, 07 Jan 2016 18:23:37 GMT

Home * Engines * Sharky

Sharky,
a chess program written by John Kominek, competing the 10th World Computer Chess Championship, 2002 in Maastricht. Sharky used some kind of best-first search, but suffered from allocating too much memory on the fast machines during the Championship, yielding in huge slowdown of the program due to swapping of memory pages from and to disk ^[1].

External Links

Chess Engine

Sharky's ICGA Tournaments

Misc

Shark from Wikipedia

References

^ Re: Poor Sharky without a single W or even D by Dann Corbit, CCC, July 11, 2002

What links here?

Page	Date Edited
Engines	Mar 10, 2018
John Kominek	Dec 30, 2016
Shark NL	Aug 7, 2015
Sharky	Jan 7, 2016
WCCC 2002	Nov 24, 2017

Up one level

Stockfish

GerdIsenberg — Sat, 07 Apr 2018 20:07:29 GMT

Home * Engines * Stockfish

		Stockfish, an UCI compatible open source chess engine developed by Tord Romstad, Marco Costalba, Joona Kiiski, and Gary Linscott ^[1] . Marco forked the project from version 2.1 of Tord's strong engine Glaurung, first announced by Marco in November 8, 2008 ^[2] , and in early 2009 Joona's Smaug, a further Glaurung 2.2 derivative, was incorporated ^[3] . Starting out among the top twenty engines, Stockfish has quickly climbed in strength. The name "Stockfish" reflects the ancestry of the engine. Tord is Norwegian and Marco Italian, and there is a long history of stockfish trade from Norway to Italy (to Marco's home town of Vicenza, in fact). Stockfish also references another famous "little fish", Rybka.
Stockfish in Reine, Lofoten ^[4]

Science versus Commerce?

Fishtest

Evaluation Guide

Tournament Play

GM+Rybka vs. Stockfish

Science versus Commerce?

There is a wide range of opinions about strong open source chess engines affecting commercial and competitive interests, as well as monetary interests from computer chess users, who obtain a top engine for free. The scientific and social value of strong open source programs is indisputable. The teamwork effort to share ideas and knowledge to write one of the strongest programs, which everybody may follow and share to learn and play for free, is definitely a challenging and motivating task, gathering both admiration and enviousness. Obviously, professional programmers of commercial chess programs are not that enthusiastic about the development, and need to improve further and/or focus more on secondary features or other business concepts like on-line play and/or user interface issues rather than on pure playing strength.

Also many hobbyist chess programmers feel in antagonism as well, not only caused by Stockfish with its highly respected authors, and before by Fruit and slightly Crafty, but from Ippolit and all its successors by pseudonymous authors and disputed origin. The implications on commercial and competitive computer chess are not quite clear, but presumably the decrease in number of participants of over the board tournaments will progress and clone suspicions may float like a Sword of Damocles over the scene, whether programmers took ideas too literally or not.

Fishtest

The Stockfish Testing Framework called Fishtest ^[5] is a web application written by Gary Linscott ^[6] ^[7] mainly in Python under the Pyramid Application Development Framework ^[8] , to distribute games across different machines to reduce the test latency and increment throughput. Started in early 2013 with Stockfish 3.0, Fishtest has hundreds of contributors, as of May 2014, 744 testers and 52 developers ^[9] active in testing ideas and tweaks ^[10] , to make Stockfish the strongest open source or even chess program of the world ^[11] .

Evaluation Guide

Since April 2017 the interactive Stockfish Evaluation Guide is available to explore Stockfish's evaluation with a JavaScript implementation running in a browser ^[12] . One may enter a FEN string of a position, to get the resulting score of the main evaluation term considering the game phases within its tapered evaluation, and may navigate through the tree of subterms and features with its particular characteristics for the given position ^[13] .

Tournament Play

Stockfish is top contender of the prestigious Thoresen Chess Engines Competition (TCEC), reaching the superfinals since season 4, losing season 4 from Houdini and season 5 from Komodo TCEC, both narrow matches with 23 - 25, but won the season 6 superfinal versus Komodo 7 conveniently with +13=45-6 and 35½ - 28½. Successor Stockfish 141214 qualified for the TCEC Season 7 Superfinal in December 2014, versus Komodo again, this time with the better end for Komodo 8 successor 1333 with 33½ - 30½. About one year later at TCEC Season 8, again Komodo and Stockfish qualified for the TCEC Season 8 Superfinal, finished with 53½ - 46½ in favour to Komodo 9.3x ^[14] , but in the following year Stockfish 8 won the superfinal conveniently this time versus the new Houdini 5 with 54½ - 45½.
.

GM+Rybka vs. Stockfish

On July 19, 2014, Stockfish 5 played a four game match versus Daniel Naroditsky plus Rybka 3 (2008), 45 minutes plus 30-second increment. Stockfish won 3½ - ½ ^[15] ^[16] . A few weeks later the experiment continued with Hikaru Nakamura in Burlingame, California ^[17] . Supported two games by Rybka 3, Nakamura lost ½ - 1½, two games with pawn odds (Stockfish both Black without h- and b-pawn) ended ½ - 1½ in favour to Stockfish 5 as well. It played the latest development build compiled for OS X running on a 3 GHz 8-Core Mac Pro ^[18] .

Selected Features

^[19]

Board Representation

Bitboards with Little-Endian Rank-File Mapping (LERF)
Magic Bitboards
BMI2 - PEXT Bitboards (not recommend for AMD Ryzen ^[20])
Piece-Lists

Search

Iterative Deepening
Aspiration Windows
Parallel Search using Threads
- YBWC prior to Stockfish 7
- Lazy SMP since Stockfish 7, January 2016
Principal Variation Search
Transposition Table
- Shared Hash Table
- 10 Bytes per Entry, 3 Entries per Cluster
- Depth-preferred Replacement Strategy
- No PV-Node probing
- Prefetch
Move Ordering
- Countermove Heuristic
- Counter Moves History since Stockfish 7, January 2016 ^[21]
- History Heuristic
- Internal Iterative Deepening
- Killer Heuristic
- MVV/LVA
- SEE
Selectivity
- Extensions
  - Check Extensions if SEE >= 0
  - Restricted Singular Extensions
- Pruning
  - Futility Pruning
  - Move Count Based Pruning
  - Null Move Pruning
    - Dynamic Depth Reduction based on depth and value
    - Static Null Move Pruning
    - Verification search at high depths
  - ProbCut
  - SEE Pruning
- Reductions
  - Late Move Reductions
  - Razoring
- Quiescence Search

Evaluation

^[22] ^[23]

Tapered Eval
Score Grain: ~1/256 of a pawn unit
Material
- Point Values
  - Midgame: 198, 817, 836, 1270, 2521
  - Endgame: 258, 846, 857, 1278, 2558
- Bishop Pair
- Imbalance Tables
- Material Hash Table
Piece-Square Tables
Space
Mobility
- Trapped Pieces
- Rooks on (Semi) Open Files
Outposts
Pawn Structure
King Safety
Evaluation Patterns

Misc

Release Dates

Stockfish 1.0 : November 02, 2008
Stockfish 1.01 : November 03, 2008
Stockfish 1.1 : December 06, 2008
Stockfish 1.1a : December 08, 2008
Stockfish 1.2 : December 29, 2008
Stockfish 1.3 : May 02, 2009
Stockfish 1.3.1 : May 03, 2009
Stockfish 1.4 : July 05, 2009
Stockfish 1.5 : October 04, 2009
Stockfish 1.5.1 : October 11, 2009
Stockfish 1.6 : December 25, 2009
Stockfish 1.6.1 : December 25, 2009
Stockfish 1.6.2 : December 31, 2009
Stockfish 1.6.3 : February 02, 2010
Stockfish 1.7 : April 08, 2010
Stockfish 1.7.1 : April 10, 2010
Stockfish 1.8 : July 02, 2010
Stockfish 1.9 : October 02, 2010
Stockfish 1.9.1 : October 05, 2010
Stockfish 2.0 : January 01, 2011
Stockfish 2.0.1 : January 04, 2011
Stockfish 2.1 : May 04, 2011
Stockfish 2.1.1 : May 08, 2011
Stockfish 2.2 : December 29, 2011
Stockfish 2.2.1 : January 06, 2012
Stockfish 2.2.2 : January 14, 2012
Stockfish 2.3 : September 15, 2012
Stockfish 2.3.1 : September 22, 2012
Stockfish 3 : April 30, 2013
Stockfish 4 : August 20, 2013
Stockfish DD : November 29, 2013
Stockfish 5 : May 31, 2014
Stockfish 6 : January 27, 2015
Stockfish 7 : January 02, 2016
Stockfish 8 : November 01, 2016
Stockfish 9 : February 01, 2018

Ports

Derivatives

Publications

Arno Nickel (2012). Die schöne neue Welt der Schachengines. SCHACH 2,3,5,6 2012, pdf (German) ^[25]
Oleg Arenz (2012). Monte Carlo Chess. B.Sc. thesis, Darmstadt University of Technology, advisor Johannes Fürnkranz, pdf » Monte-Carlo Tree Search
Tamal T. Biswas, Kenneth W. Regan (2015). Quantifying Depth and Complexity of Thinking and Knowledge. ICAART 2015, pdf
Tamal T. Biswas, Kenneth W. Regan (2015). Measuring Level-K Reasoning, Satisficing, and Human Error in Game-Play Data. IEEE ICMLA 2015, pdf preprint
Shu Yokoyama, Tomoyuki Kaneko, Tetsuro Tanaka (2015). Parameter-Free Tree Style Pipeline in Asynchronous Parallel Game-Tree Search. Advances in Computer Games 14 , pdf » P-GPP
Jean-Marc Alliot (2017). Who is the Master? ICGA Journal, Vol. 39, No. 1, draft as pdf ^[26]

Videos

How do modern chess engines work? | Video, Talk by Daylen Yang, TNG | Big Techday 8, June 12, 2015
Parallelism and Selectivity in Game Tree Search | Video, Talk by Tord Romstad, TNG | Big Techday 8, June 12, 2015

Forum Posts

2008

Stockfish 1.0 by Marco Costalba, CCC, November 02, 2008
Please drop Stockfish by Marco Costalba, CCC, November 07, 2008

2009

Re: Stockfish - Glaurung by Tord Romstad, WBEC-Ridderkerk forum, September 05, 2009
Stockfish 1.5.1 by Marco Costalba, CCC, October 08, 2009

2010

Stockfish 1.7 by Marco Costalba, CCC, April 08, 2010
Stockfish-1.7.0 Hyper-threading Detection by Louis Zulli, CCC, April 09, 2010 » Thread
stockfish fail high fail low by Uri Blass, CCC, April 13, 2010
MTD experiment with stockfish 1.7.1 by Vratko Polák, CCC, April 15, 2010
about stockfish and logic by Uri Blass, CCC, April 17, 2010
Stockfish - material balance/imbalance evaluation by Ralph Stoesser, CCC, May 05, 2010
Qsearch of Stockfish 1.7.1 by Ferdinand Mosca, CCC, May 13, 2010
Stockfish do_move + undo_move by Matthew Purland, CCC, June 02, 2010
static null move pruning is stockfish by Tom King, CCC, June 13, 2010
Stockfish - single evasion extensions by Ralph Stoesser, CCC, June 27, 2010
Stockfish 1.8 JA available by Jim Ablett, CCC, July 02, 2010
stockfish 1.8 - Eval hash gone? by Edward Yu, CCC, July 04, 2010
Stockfish Singular Extension, does it make sense? by Volker Böhm, CCC, July 08, 2010
Stockfish 1.8 tweaks by Vratko Polák, CCC, July 09, 2010
Stockfish question by Rebel, OpenChess Programming Forum, July 10, 2010
Taken from CCC (Stockfish & mainlines) by Rebel, OpenChess Programming Forum, July 12, 2010
backward pawns in Stockfish by Marek Kwiatkowski, CCC, July 16, 2010
Questions for the Stockfish team by Michael Sherwin, CCC, July 16, 2010
Stockfish 1.8 - eval cache by Ralph Stoesser, CCC, July 18, 2010 » Evaluation Hash Table
Stockfish null move pre-condition by Rein Halbersma, CCC, July 22, 2010 » Null Move Pruning
Stockfish for 39 dollars by Matthias Gemuh, CCC, August 26, 2010
Stockfish 1.9 JA update available by Jim Ablett, CCC, October 02, 2010
mobility evaluation of stockfish by Uri Blass, CCC, October 09, 2010

2011

Stockfish 2.0 Available by Jim Ablett, CCC, January 01, 2011
Stockfish 2.0.0 tests by Harun Taner, CCC, January 04, 2011
Stockfish "Use Sleeping Threads" Test by Louis Zulli, CCC, January 05, 2011
StockFish engine by Andriy Dzyben, CCC, January 11, 2011
Designing an analysis friendly Stockfish? by Uly, Open Chess Programming Forum, January 28, 2011
Why are the Ippo derivative stronger than Stockfish? by Larry Kaufman, CCC, 24 February, 2011
Transposition Table updates in Stockfish by Onno Garms, CCC, April 12, 2011 » Transposition Table
Stockfish random generator (rkiss.h) by Martin Sedlak, CCC, Apr 15, 2011 » Bob Jenkins
futility pruning in stockfish by Engin Üstün, CCC, May 25, 2011 » Futility Pruning
Stockfish clones in the AppStore: it's becoming a plague... by Julien Marcel, CCC, May 28, 2011 » Clones
Root node search in Stockfish by Onno Garms, CCC, June 12, 2011 » Move Ordering, Root
Grandmaster prefers Stockfish evals by Albert Silver, CCC, September 29, 2011
Stockfish on github by Marco Costalba, CCC, October 02, 2011
Stockfish's tuning method by Joona Kiiski, CCC, October 07, 2011 » Stockfish's Tuning Method

2012

StockFish LS with LimitStrength feature by Alexander Schmidt, CCC, January 01, 2012
Stockfish Code ( Piece Value's) by Nolan Denson, CCC, January 10, 2012 » Point Value
Stockfish hash implementation by Jon Dart, CCC, January 10, 2012 » Transposition Table
Stockfish 2.2.2 JA update available by Jim Ablett, CCC, January 14, 2012
CLOP on Stockfish by Gary, CCC, March 10, 2012 » CLOP
optimal aspiration window for stockfish question by Uri Blass, CCC, March 12, 2012 » Aspiration Windows
Raspberry Pi / Stockfish dedicated chess computer/board by Jean-Francois Romang, CCC, August 26, 2012 » Raspberry Pi, Dedicated Chess Computers
Stockfish 2.3 update available by Jim Ablett, CCC, September 15, 2012

2013

10 Lessons to be Learned from todays Top Engines by Josef, Rybka Forum, January 03, 2013 » Houdini, Komodo
Stockfish 3 Official JA Windows/Linux builds available by Jim Ablett, CCC, April 30, 2013
Fishtest Distributed Testing Framework by Marco Costalba, CCC, May 01, 2013 » Fishtest
Re: History pruning / move ordering question by Joona Kiiski, CCC, May 12, 2013 » Countermove Heuristic
Stockfish 3 PA_GTB by Jeremy Bernstein, OpenChess Forum, May 15, 2013
Probcut by Gary, CCC, May 24, 2013 » ProbCut
Stockfish bug by Steven Atkinson, CCC, May 30, 2013 » Repetitions
The Ultimate Stockfish! by Mike Scheidl, CCC, July 09, 2013
use sleeping threads by Don Dailey, CCC, July 10, 2013 » Parallel Search, Thread
Stockfish 4 by Marco Costalba, CCC, August 20, 2013
18 days from SF4 release and about ~30+ ELO gain! by Alexandre Meirelles Souza, CCC, September 08, 2013
How much of Stockfish code is still from Tord Romstad? by Jouni Uski, CCC, September 16, 2013
Syzygy tablebases, work in Stockfish? by Jose Mº Velasco, CCC, September 23, 2013 » Syzygy Bases
Stockfish search by Harm Geert Muller, CCC, October 28, 2013 » Principal variation
Some food for thought by Spacious Mind, Hiarcs Forum, November 11, 2013 » Stockfish vs. Tasc CM32 512K The King 2.2
Stockfish scaling by Ed Schröder, CCC, November 15, 2013
Stockfish depth vs. others; challenge by Larry Kaufman, CCC, November 24, 2013 » Depth
Stockfish DD: a new official release by Marco Costalba, CCC, November 29, 2013 » TCEC Season 5, dedicated to Don Dailey
Stockfish Syzygy: how to interpret mates? by Jouni Uski, CCC, December 01, 2013 » Syzygy Bases, Mate Scores
Is SF DD greater efficiency would be null move pruning? by Jonathan Lee, CCC, December 22, 2013 » Null Move Pruning

2014

Help me to test an idea for Stockfish by Robert Tournevisse, CCC, January 03, 2014 » Piece-Square Tables, Tapered Eval
Stockfish seems definitely the strongest engine by Kai Laskos, CCC, January 21, 2014
Stockfish Mac app by Daylen Yang, CCC, January 22, 2014 » Macintosh
Stockfish goes EGBB by Daniel Shawul, CCC, January 29, 2014 » Scorpio Bitbases
fixing the null move search "bug" by Uri Blass, CCC, February 01, 2014 » Null Move Pruning
Disabling Null Move Pruning in Stockfish by Louis Zulli, CCC, February 15, 2014 » Null Move Pruning
Threads-Test by Andreas Strangmüller, CCC, March 18, 2014 » Thread, Parallel Search
Stockfish haswell optimized build by Jean-Francois Romang, CCC, April 06, 2014 » BMI2
Huge simplification by Lyudmil Tsvetkov, CCC, April 25, 2014 » Pawn chain
Stockfish zero evals by Larry Kaufman, CCC, May 02, 2014
Threads-Test - SF, Zappa, Komodo - 1 vs. 2, 4, 8, 16 Threads by Andreas Strangmüller, CCC, May 04, 2014 » Thread, Stockfish, Zappa, Komodo
investigating why stockfish is strong idea by Uri Blass, CCC, May 05, 2014
Threads factor: Komodo, Houdini, Stockfish and Zappa by Andreas Strangmüller, CCC, May 17, 2014 » Komodo, Houdini, Stockfish, Zappa
Goodbye CLOP, hello SPSA by Gary Linscott, FishCooking, May 17, 2014 » CLOP, SPSA
Stockfish 5 by Marco Costalba, CCC, May 31, 2014
Stockfish Status Report by Louis Zulli, CCC, June 27, 2014
GM and Rybka vs. Stockfish by Robert Maddox, CCC, August 09, 2014 » GM+Rybka vs. Stockfish
Nakamura vs Stockfish, public match 8/23 by Jesse L, CCC, August 17, 2014
Using the Stockfish position evaluation score to predict victory probability by unavoidablegrain, Tumblr, September 28, 2014 » Pawn Advantage, Win Percentage, and Elo
Threads test incl. Stockfish 5 and Komodo 8 by Andreas Strangmüller, CCC, October 09, 2014
Threads test - Stockfish 5 against Komodo 8 by Andreas Strangmüller, CCC, October 10, 2014 » Thread, Parallel Search, Stockfish, Komodo
Stockfish and accurate PV by Matthew Lai, CCC, December 25, 2014 » Principal variation
Stockfish 32-bit and hardware instructions on MSVC++ by Syed Fahad, CCC, December 30, 2014 » BitScan, Population Count

2015

Stockfish in Lozza UIs by Colin Jenkins, CCC, January 07, 2015 » Lozza, Stockfish-js ^[27]
SF6 has been released by Joona Kiiski, CCC, January 27, 2015
Stockfish 6 is impressive in Behting study by Jouni Uski, CCC, January 31, 2015 » Behting Study
Stockfish with 16 threads - big news? by Louis Zulli, CCC, February 15, 2015 » Thread
Explanation for non-expert? by Louis Zulli, CCC, February 16, 2015 » Parallel Search
Stockfish still scales poorly? by Louis Zulli, CCC, February 20, 2015
Measuring SF idle time by Louis Zulli, CCC, February 21, 2015
Better NPS scaling for Stockfish by Louis Zulli, CCC, February 27, 2015
Stockfish Questions by Syed Fahad, CCC, February 28, 2015
Best Stockfish NPS scaling yet by Louis Zulli, CCC, March 02, 2015
Stockfish contempt factor by Kai Laskos, CCC, March 10, 2015 » Contempt Factor
Improving SF passer code by Lyudmil Tsvetkov, CCC, March 26, 2015 » Connected Passed Pawns
Problem with SF6 and Syzygy TB by Forrest Hoch, CCC, April 01, 2015 » Syzygy Bases
Empirical results with Lazy SMP, YBWC, DTS by Kai Laskos, CCC, April 16, 2015 » Lazy SMP, YBWC, DTS
The effective speedup from 1 to 8 cpus for SF and Komodo by Adam Hair, CCC, May 31, 2015 » Parallel Search, Komodo
New Stockfish with Lazy_SMP, but what about the TC bug ? by Ernest Bonnem, CCC, October 26, 2015 » Parallel Search, TCEC Season 8
Binary for TCEC superfinal by Kiran Panditrao, FishCooking, October 30, 2015 » TCEC Season 8
SF binaries for TCEC superfinal by Marco Costalba, CCC, October 31, 2015
Stockfish dev 091115 for ANDROID by Nathanael Russell, CCC, November 09, 2015 » Android
Stockfish now benefits from hyperthreading by Dmitri Gusev, CCC, November 12, 2015 » Thread
Stockfish 7 beta 1 by Joona Kiiski, CCC, December 27, 2015
Another GHI example in SF (maybe) by BB+, OpenChess Forum, December 30, 2015 » Graph History Interaction

2016

Stockfish 7 by Joona Kiiski, CCC, January 02, 2016
Threads test incl. Stockfish 7 by Andreas Strangmüller, CCC, January 11, 2016 » Thread, Parallel Search
Stockfish 7 progress by Carl Lumma, CCC, January 16, 2016
Oddity around depths 7-8 with Stockfish 6 & 7 by Ken Regan, CCC, January 21, 2016
Stockfish 7 and partial 6 piece syzygy problem? by Jouni Uski, CCC, March 01, 2016
Re: Stockfish 7 and partial 6 piece syzygy problem? by Marco Costalba, CCC, September 01, 2016
Computer Chess Progress: Stockfish 7 vs Ruffian 1.0.5 by Martin Fierz, CCC, March 17, 2016 » Ruffian
Natural TB by Marco Costalba, CCC, May 29, 2016 » Syzygy Bases
Stockfish eval output by Erin Dame, CCC, August 27, 2016 » Wrong color Bishop and rook pawn
Re: Beginner's guide to graphical profiling by Marco Costalba, CCC, September 10, 2016 » Profiling
ELO inflation ha ha ha by Henk van den Belt, CCC, September 16, 2016 » Delphil, Match Statistics, Playing Strength, TCEC Season 9 ^[28]
Stockfish underpromotes much more often than Komodo by Kai Laskos, CCC, October 05, 2016 » Komodo, Match Statistics, Promotions
couple of questions about stockfish code ? by Mahmoud Uthman, CCC, October 26, 2016 » SIMD and SWAR Techniques, Tapered Eval
Stockfish 8 by Marco Costalba, FishCooking, November 01, 2016
Stockfish 8 official by Marco Costalba, CCC, November 01, 2016
NUMA test compilation by Joachim Müller, FishCooking, November 05, 2016 » NUMA
Stockfish 8 - Double time control vs. 2 threads by Andreas Strangmüller, CCC, November 15, 2016 » Doubling TC, Diminishing Returns, Playing Strength, Lazy SMP
Stockfish benchmark data by Adam Hair, OpenChess Forum, November 27, 2016
The new chess rules (5-fold repetition and 75-move draw) by Lyudmil Antonov, FishCooking, November 29, 2016 » Repetitions, Fifty-move Rule
Scoutfish: powerful chess query tool by Marco Costalba, CCC, December 11, 2016 » Databases, Portable Game Notation, Scoutfish

2017

SF Progression since Fishtest inception by Adam Hair, CCC, January 14, 2017 » Fishtest
Re: Chessprogams with the most chessknowing by Marco Costalba, CCC, February 19, 2017 » Search versus Evaluation
Symmetric multiprocessing (SMP) scaling - SF8 and K10.4 by Andreas Strangmüller, CCC, May 05, 2017 » Lazy SMP, Komodo
Symmetric multiprocessing (SMP) scaling - SF8 Contempt=10 by Andreas Strangmüller, CCC, May 13, 2017 » SMP, Contempt Factor
Stockfish version with hash saving capability by Daniel José Queraltó, CCC, July 25, 2017 » Persistent Hash Table
Natural TB (take 2) by Marco Costalba, CCC, August 22, 2017 » Syzygy Bases
Approximating Stockfish's Evaluation by PSQTs by Thomas Dybdahl Ahle, CCC, August 23, 2017 » Regression, Piece-Square Tables
Stockfish no progress in 2month and half , why ? by Jean Baptiste, CCC, August 28, 2017
Stockfish testing at STC and LTC: one question by Jouni Uski, CCC, September 19, 2017
Scaling from FGRL results with top 3 engines by Kai Laskos, CCC, September 26, 2017 » FGRL, Houdini, Komodo
AlphaZero vs Stockfish by Bigler, CCC, December 06, 2017 » AlphaZero vs. Stockfish
A branch to test the Monte Carlo algorithm in Stockfish by Stephane Nicolet, FishCooking, December 06, 2017 » Monte-Carlo Tree Search, AlphaZero
Reactions about AlphaZero from top GMs... by Norman Schmidt, CCC, December 08, 2017 » AlphaZero: Reactions From Top GMs, Stockfish Author, Tord Romstad
MCTS wrapper for StockFish by Jonathan Baxter, FishCooking, December 19, 2017 » Monte-Carlo Tree Search

2018

Stockfish 8 - Initial position until depth 59 by Andreas Strangmüller, CCC, January 16, 2018 » Initial Position
New Stockfish contempt by Jouni Uski, CCC, January 29, 2018 » Contempt Factor
Stockfish 9 by Marco Costalba, CCC, February 01, 2018
Elo measurement of contempt in SF in self-play by Michel Van den Bergh, CCC, March 10, 2018 » Contempt, Playing Strength
Stockfish 180113 - Initial position until depth 65 by Andreas Strangmüller, CCC, March 27, 2018 » Initial Position

External Links

Chess engine

Stockfish Chess Engine Home
Stockfish Blog
Get Involved - Stockfish - Powerful Open Source Chess Engine
Stockfish Testing Framework » Fishtest
Stockfish Evaluation Guide » Stockfish Evaluation Guide
FishCooking - Google Groups a discussion group for developers and testers of Stockfish chess engine
Welcome - Stockfish Support
official-stockfish/Stockfish · GitHub
zamar · GitHub by Joona Kiiski
SPSA Tuner for Stockfish Chess Engine » SPSA
Stockfish Development Versions hosted by Roman Korba
Stockfish Development Versions for macOS
stockfishchess on Twitter
Stockfish (chess) from Wikipedia
Arduino & Raspberry PI Chess Computer running Stockfish on Raspberry Pi, by Max Dobres » Arduino, Sensory Board
One chess champion per laptop by Roberto Perez-Franco, MIT's The Tech, January 15, 2014 » TCEC Season 5
And then there were two by John Hartmann, ChessBase News, June 09, 2015 » Komodo, Stockfish
Depth of Satisficing by Ken Regan, Gödel's Lost Letter and P=NP, October 06, 2015 » Depth, Match Statistics, Pawn Advantage, Win Percentage, and ELO, Stockfish, Komodo ^[29]
A Chess Firewall at Zero? by Ken Regan, Gödel's Lost Letter and P=NP, January 21, 2016
Adam's Computer Chess Pages: Stockfish Progression by Adam Hair » Fishtest

Rating Lists

Stockfish from CCRL 40/40
Stockfish 5 64-bit 4CPU in CCRL 40/4

Matches

Can a GM and Rybka beat Stockfish? by GM Daniel Naroditsky, Chess.com, August 08, 2014 » GM+Rybka vs. Stockfish
Stockfish Outlasts "Rybkamura" by FM Mike Klein, Chess.com, August 24, 2014
AlphaZero: Reactions From Top GMs, Stockfish Author by Peter Doggers, Chess.com, December 08, 2017 » AlphaZero vs. Stockfish

Interviews

Computerschach, Interview with Tord Romstad (Norway), Joona Kiiski (Finland) and Marco Costalba (Italy) by Frank Quisinsky, March 29, 2010
Stockfish 4 to play in the new season of TCEC | Chessdom - Short interview with the Stockfish team, August 22, 2013 » TCEC, TCEC Season 5

Misc

Stockfish from Wikipedia
Lofoten Stockfish Museum from Wikipedia
Stockfish from Norsk Fiskeværsmuseum, Å, Moskenes
Postcards from the Lofoten Islands from Giving Up The Ghost, May 29, 2012 » Stockfish and Gulls

References

^ Stockfish 7 by Joona Kiiski, CCC, January 02, 2016
^ Stockfish 1.0 by Marco Costalba, CCC, November 02, 2008
^ Re: Smaug: a new chess engine based on glaurung by Marco Costalba, CCC, March 12, 2009
^ Lofoten - Seeing is believing - The fisheries
^ glinscott/fishtest · GitHub
^ Get Involved - Stockfish - Powerful Open Source Chess Engine
^ Fishtest Distributed Testing Framework by Marco Costalba, CCC, May 01, 2013
^ The Pyramid Web Framework — The Pyramid Web Framework v1.5
^ Stockfish Testing Framework - Users
^ Stockfish Testing Framework
^ Adam's Computer Chess Pages: Stockfish Progression by Adam Hair
^ Re: How far away are we from deep learning Stockfish, Komodo by Gary, CCC, May 21, 2017
^ Stockfish Evaluation Guide
^ Soccer-like chess by Marco Costalba, CCC, November 29, 2015
^ Can a GM and Rybka beat Stockfish? by GM Daniel Naroditsky, Chess.com, August 08, 2014
^ GM and Rybka vs. Stockfish by Robert Maddox, CCC, August 09, 2014
^ Nakamura vs Stockfish, public match 8/23 by Jesse L, CCC, August 17, 2014
^ Stockfish Outlasts "Rybkamura" by FM Mike Klein, Chess.com, August 24, 2014
^ based on the sources of Stockfish 6
^ Ryzen and BMI2: Strange behavior and high latencies by DonnieTinyHands, Reddit, March 20, 2017
^ Re: Stockfish 7 progress by Lucas Braesch, CCC, January 17, 2016
^ See also Evaluation Philosophy and The Art of Evaluation by Tord Romstad, CCC, August 2, 2007
^ Stockfish Evaluation Guide
^ exoticorn/stockfish-js · GitHub
^ Part 1 covers Houdini, Rybka, Komodo, Stockfish, Critter, Naum, Chiron and Spike
^ Who is the Master? from Jean-Marc Alliot's professional website
^ exoticorn/stockfish-js · GitHub
^ Delphil 3.3b2 (2334) - Stockfish 030916 (3228), TCEC Season 9 - Rapid, Round 11, September 16, 2016
^ Regan's latest: Depth of Satisficing by Carl Lumma, CCC, October 09, 2015

What links here?

Page	Date Edited
Adam Hair	Jan 14, 2017
Albert Silver	Feb 25, 2018
Aleks Peshkov	Jan 13, 2016
Alexander Schmidt	May 17, 2016
Alexander Szabo	Nov 10, 2012
Alfil	Sep 3, 2015
AlphaZero	Feb 10, 2018
Andreas Strangmüller	May 15, 2017
Android	Jan 9, 2018
Andscacs	Jan 16, 2018
Arduino	Feb 21, 2018
Arno Nickel	Sep 25, 2015
asmFish	Feb 14, 2018
Aspiration Windows	Nov 1, 2017
Assembly	Sep 3, 2017
Automated Tuning	Feb 27, 2018
Balint Pfliegel	Aug 30, 2015
Behting Study	Feb 1, 2015
BitScan	Sep 10, 2017
BMI2	Mar 6, 2018
Bob Jenkins	Jun 3, 2017
Bookup	Feb 4, 2018
Bouquet	May 17, 2016
Brainfish	Oct 8, 2017
Branching Factor	Jun 28, 2017
CFish	Feb 1, 2018
Chess Wizard (GUI)	Sep 27, 2011
ChessBrainVB	Jun 24, 2017
ChessMachine	Feb 26, 2018
ChessX	Feb 26, 2015
Chiron	Sep 24, 2017
Clemens Keck	Oct 15, 2017
Clones	Jan 16, 2017
CLOP	Nov 24, 2016
Computer Chess Forums	Nov 26, 2017
Connected Passed Pawns	Mar 27, 2015
Contempt Factor	Mar 10, 2018
Copy-Make	May 23, 2017
Crafty	Jan 28, 2018
Crazyhouse	Dec 27, 2017
Critter	Jan 25, 2014
CuckooChess	Jan 17, 2017
Daniel José Queraltó	Dec 31, 2017
Daylen Yang	Sep 8, 2017
Dedicated Chess Computers	Feb 20, 2018
Delphil	Sep 17, 2016
Depth	Feb 25, 2018
DGT Board	Feb 21, 2018
DGT Pi	Oct 22, 2017
DON	Oct 8, 2017
Don Dailey	Dec 7, 2016
Donna	Aug 17, 2017
Draw	Apr 14, 2018
Draw Evaluation	Mar 12, 2018
DroidFish	Jan 17, 2017
Ehsan Rashid	May 4, 2015
Endgame Tablebases	Mar 6, 2018
Engine releases	Apr 23, 2018
Engine Testing	Feb 1, 2018
Engines	Mar 10, 2018
Equinox	Dec 12, 2016
Erin Dame	Dec 2, 2017
Ethereal	Mar 20, 2018
Evaluation	Feb 1, 2018
Evaluation Hash Table	Dec 4, 2016
Evaluation of Pieces	Jan 8, 2018
Fauzi Akram Dabat	Jan 23, 2017
FGRL	Oct 1, 2017
Fifty-move Rule	Aug 9, 2017
Frederic Friedel	Jan 6, 2018
Frédéric Prost	Oct 16, 2014
Futility Pruning	Aug 30, 2017
Game Phases	May 22, 2017
Gary Linscott	Jan 16, 2018
Gavon	Apr 30, 2018
Glaurung	Mar 14, 2017
Graph History Interaction	Oct 16, 2017
Hakkapeliitta	Apr 26, 2016
Harun Taner	May 17, 2015
History Heuristic	Jul 19, 2017
Houdini	Apr 14, 2018
Initial Position	Apr 14, 2018
IPON	Jun 2, 2014
Iteration	May 5, 2017
JavaScript	Dec 11, 2017
Jean-Francois Romang	Oct 23, 2017
Jean-Marc Alliot	Jun 28, 2017
Jeremy Bernstein	Nov 15, 2016
Jonathan Baxter	Feb 11, 2018
Joona Kiiski	Aug 31, 2017
Jose Maria Velasco	Feb 27, 2014
Jouni Uski	Sep 28, 2017
Kai Laskos	Jan 21, 2018
Kenneth Wingate Regan	Feb 19, 2018
King Safety	Feb 14, 2018
Knowledge	Jul 22, 2017
Komodo	Mar 6, 2018
Kvetka	Mar 28, 2016
Larry Kaufman	Jan 28, 2018
Laser	Dec 27, 2017
Late Move Reductions	Sep 25, 2017
Lazy SMP	Jan 4, 2018
LCZero	Apr 18, 2018
Logging	Jan 20, 2018
Louis Zulli	Feb 18, 2015
Lozza	Apr 18, 2018
Lyudmil Antonov	Aug 31, 2017
Lyudmil Tsvetkov	Mar 28, 2018
Macintosh	Dec 7, 2016
Magic Bitboards	Apr 13, 2018
Marcel van Kervinck	Dec 6, 2017
Marco Costalba	Feb 28, 2018
Marek Kwiatkowski	Oct 22, 2017
Mark Watkins	Dec 6, 2017
Martin Fierz	Apr 26, 2018
Martin Sedlak	Dec 25, 2017
Match Statistics	Mar 31, 2018
Material	Mar 31, 2018
Max Dobres	Sep 21, 2016
McBrain	Feb 14, 2018
Mehdi Mhalla	Apr 25, 2014
Memory	Dec 8, 2017
Michael Byrne	Jun 23, 2017
Michel Van den Bergh	Mar 10, 2018
Milos Stanisavljevic	May 23, 2016
Monte-Carlo Tree Search	Apr 26, 2018
Move Ordering	Feb 27, 2018
MTD(f)	Jul 17, 2017
Naum	Nov 23, 2017
Nemorino	Dec 21, 2017
Null Move Pruning	Dec 2, 2017
NUMA	Mar 29, 2017
Oleg Arenz	Feb 1, 2016
One Reply Extensions	Dec 31, 2014
Onno Garms	Jul 19, 2013
Open Source Engines	Jul 14, 2015
Optimization	Feb 28, 2018
Parallel Search	Dec 30, 2017
Pascal Georges	Jun 1, 2014
Pawn Advantage, Win Percentage, and Elo	Dec 20, 2017
Pawn chain	Jan 17, 2018
Persistent Hash Table	Dec 31, 2017
Peter Österlund	Aug 24, 2017
PicoChess	Mar 12, 2018
Piece-Square Tables	Mar 31, 2018
Playing Strength	Mar 31, 2018
Plisk	Dec 31, 2014
Point Value	Mar 31, 2018
Point Value by Regression Analysis	Aug 26, 2017
Population Count	Sep 3, 2017
Portfish	Sep 8, 2016
Principal variation	Dec 4, 2017
ProbCut	Mar 25, 2016
Profiling	Sep 15, 2016
Promotions	Jun 6, 2017
Protector	Oct 12, 2017
Pseudorandom number generator	May 11, 2017
PuppetMaster	Sep 17, 2015
Rahul A. R.	Jan 22, 2017
Ralph Stoesser	Aug 8, 2015
Raspberry Pi	Jun 7, 2017
Raspberry Turk	Sep 7, 2017
Rebel	Feb 25, 2018
RedQueen	Nov 13, 2017
Rein Halbersma	Dec 22, 2015
Relative History Heuristic	Jun 8, 2015
Repetitions	Jan 16, 2018
Revelation II	Jan 8, 2018
Reverse Futility Pruning	Jun 2, 2017
Robert Houdart	Dec 8, 2017
Roman Korba	Nov 28, 2014
Ronald de Man	Nov 20, 2017
Rook Endgame	Sep 18, 2017
Root	Sep 26, 2016
Ruffian	Jun 6, 2017
Rybka	Mar 27, 2017
Salvo Spitaleri	Mar 11, 2013
Scid on the Go	Jan 26, 2015
Score	Apr 14, 2018
Scorpio Bitbases	Mar 12, 2018
Search Statistics	Jan 16, 2018
Selectivity	Jan 12, 2018
Sensory Board	Mar 1, 2018
Shu Yokoyama	Oct 25, 2017
SIMD and SWAR Techniques	Jun 27, 2017
Singular Extensions	Jan 9, 2018
Smaug	Sep 8, 2016
SMP	Dec 26, 2017
Space	Jan 18, 2018
Spike	Jan 7, 2016
SPSA	May 8, 2017
Stefan Pohl	Jan 14, 2018
Sting	Mar 16, 2018
Stockfish	Apr 7, 2018
Stockfish's tuning method	May 21, 2017
Stockfish-js	Sep 23, 2017
Strelka	May 17, 2016
SugaR	Oct 9, 2017
Sunfish	Jan 11, 2018
Syed Fahad	Jan 1, 2017
Syzygy Bases	Apr 19, 2018
Tamal T. Biswas	Jun 19, 2017
Tapered Eval	Jan 9, 2018
Tarrasch	Apr 15, 2017
TCEC	Apr 18, 2018
TCEC Season 10	Jan 3, 2018
TCEC Season 11	Apr 18, 2018
TCEC Season 5	Jun 2, 2014
TCEC Season 6	Dec 2, 2014
TCEC Season 7	Jan 23, 2015
TCEC Season 8	Nov 30, 2015
TCEC Season 9	Nov 6, 2017
Tetsuro Tanaka	Oct 25, 2017
Texel's Tuning Method	Dec 2, 2017
The Spacious Mind	Jan 18, 2017
Thomas Dybdahl Ahle	Aug 26, 2017
Thread	Apr 22, 2018
Time Management	Mar 20, 2018
Tom King	Aug 19, 2017
Tomoyuki Kaneko	Oct 25, 2017
Tord Romstad	Dec 9, 2017
Tournaments	Dec 21, 2017
Transposition Table	Apr 19, 2018
UCI	Mar 4, 2018
UCT	Jan 22, 2018
University of California, Berkeley	Sep 5, 2016
Uri Blass	Feb 26, 2018
USB Chess Board	Apr 21, 2015
Volker Böhm	Jan 7, 2016
WChess	Jan 7, 2016
WCRCC 2009	Jul 14, 2014
Who's Who	Sep 6, 2017
Wrong color Bishop and rook pawn	Oct 19, 2017
WyldChess	Mar 10, 2018
Xiphos	Apr 22, 2018
Yakup Ipek	Sep 6, 2015
Zappa	Oct 24, 2017

Up one Level

Sunfish

GerdIsenberg — Thu, 11 Jan 2018 20:50:13 GMT

Home * Engines * Sunfish

		Sunfish, a simple open source chess engine under the GPL written by Thomas Dybdahl Ahle in Python for didactic purposes, inspired by Harm Geert Muller's Micro-Max ^[1] . Without the code lines of the piece-square tables and its simple command line interface, it takes up just 111 lines of code.
Pygmy sunfish ^[2]

Description

Sunfish applies MTD-bi, the binary search version of MTD(f) ^[3] , also known as NegaC* as proposed by Jean-Christophe Weill in 1990 ^[4] ^[5] , which is based on C*, introduced by Kevin Coplan in 1981 at Advances in Computer Chess 3 ^[6] . MTD-bi is embedded inside an iterative deepening framework. Its fail-soft scout originally lacked the quiescence search, which made it blunder pretty badly in some positions ^[7] , but a version of this was later added ^[8]. The rudimentary evaluation considers point values and piece-square tables - an aggregated score is incremental updated during make move.

Etymology

Sunfish is named after the Pygmy Sunfish, which is amoung the very few fish to start with the letters 'Py', and refers other famous fish engines such as Stockfish and Rybka ^[9] .

Postings

Sunfish – A 111 line Chess Engine in Python by Thomas Dybdahl Ahle, reddit, February 16, 2014
SUNFISH - a new chess engine written in Python ! by Ruxy Sylwyka, CCC, February 27, 2014
New version of Sunfish by Thomas Dybdahl Ahle, CCC, August 20, 2016
Sunfish (Python Engine) by Norbert Raimund Leisner, CCC, January 02, 2018

External Links

Chess Engine

thomasahle/sunfish · GitHub

Misc

References

^ Sunfish – A 111 line Chess Engine in Python by Thomas Dybdahl Ahle, reddit, February 16, 2014
^ Pygmy sunfish (Elassoma sp.). Drawing by Duane Raver for the United States Fish and Wildlife Service, Pygmy sunfish from Wikipedia
^ Aske Plaat, Jonathan Schaeffer, Wim Pijls, Arie de Bruin (1995). A New Paradigm for Minimax Search. Technical Report EUR-CS-95-03. pdf
^ Jean-Christophe Weill (1991). Experiments With the NegaC* Search - An Alternative for Othello Endgame Search. Heuristic Programming in AI 2
^ Jean-Christophe Weill (1992). The NegaC* Search. ICCA Journal, Vol. 15, No. 1
^ Kevin Coplan (1982). A special-purpose machine for an improved search algorithm for deep chess combinations. Advances in Computer Chess 3
^ Re: SUNFISH - a new chess engine written in Python ! by Thomas Dybdahl Ahle, CCC, February 28, 2014
^ Re: SUNFISH - a new chess engine written in Python ! by Thomas Dybdahl Ahle, CCC, February 28, 2014
^ thomasahle/sunfish · GitHub

What links here?

Page	Date Edited
Deep Pink	Feb 6, 2017
Engines	Mar 10, 2018
Open Source Engines	Jul 14, 2015
Sunfish	Jan 11, 2018
Thomas Dybdahl Ahle	Aug 26, 2017
Xiphos	Apr 22, 2018

Up one level

Witchess

GerdIsenberg — Wed, 22 Apr 2015 20:57:16 GMT

Home * Engines * Witchess

		Witchess, (PMess, Npmess, NPMchess) a private chess engine by Mridul Muralidharan, presumably successor or branch of his experimental MessChess program. Witchess played a strong CCT7, the CCT8 under the handle PMess (parallel Mess) ^[1], and the CCT9 as NPMchess ^[2]. At ICC, Witchess is known under the handle Npmess, applying a parallel search, so far on a dual core AMD processor ^[3].
Hans Baldung, Three Witches, ca. 1514 ^[4]

Selected Games

CCT7, round 8, Witchess - Arasan ^[5] ^[6]

[Event "CCT7"]
[Site "chessclub.com"]
[Date "2005.02.13"]
[Round "8"]
[White "Witchess"]
[Black "Arasan 9.0"]
[Result "1-0"]
 
1.e4 e5 2.Nc3 Nf6 3.Bc4 Nc6 4.Nf3 Nxe4 5.Nxe4 d5 6.Bd3 dxe4 7.Bxe4 Ne7 8.c3 f5 
9.Bc2 e4 10.Ne5 Qd5 11.f4 exf3 12.Nxf3 Qe6+ 13.Kf2 Qb6+ 14.d4 Be6 15.Ba4+ c6 
16.Re1 Bd5 17.Bb3 O-O-O 18.Bg5 Qc7 19.Bxd5 cxd5 20.Qe2 Qb6 21.c4 Rd7 22.cxd5 Kb8 
23.Qe5+ Ka8 24.d6 Rxd6 25.Bxe7 Bxe7 26.Qxe7 Rc8 27.Kg1 Rg8 28.Rac1 Rdd8 1-0

Forum Posts

Most brilliant novelty from cct7 Witchess-Arasan by Vincent Diepeveen, CCC, February 14, 2005 » CCT7
pmess at cct by Mridul Muralidharan, CCC, February 27, 2006 » CCT8

External Links

Chess Engine

Finger witchess from ICC

Witch

Witchcraft

Which-cult

Witch-hunt and trial

Chess

Fiction

Fish

Misc

Harwell computer (WITCH) from Wikipedia
Witch of Agnesi from Wikipedia
Julie Driscoll, Brian Auger and the Trinity - Season Of The Witch, 1968, YouTube Video

References

^ pmess at cct by Mridul Muralidharan, CCC, February 27, 2006
^ Private Engine List from Ron Murawski's Computer-Chess Wiki
^ Finger witchess from ICC
^ Hans Baldung, New Year’s Wish with Three Witches, ca. 1514, Pen drawing heightened with white body colour on brown prepared paper, Current location: Musée du Louvre, Skyclad (Neopaganism) from Wikipedia, European witchcraft from Wikipedia
^ a few notes from Arasan's games in CCT7 by Jon Dart, CCC, February 14, 2005
^ Most brilliant novelty from cct7 Witchess-Arasan by Vincent Diepeveen, CCC, February 14, 2005
^ Gardnerian Wicca from Wikipedia

What links here?

Page	Date Edited
Bruja	Feb 3, 2015
CCT7	Dec 16, 2017
CCT8	Apr 6, 2013
CCT9	Aug 25, 2013
Engines	Mar 10, 2018
Hexxpawn	Oct 22, 2014
MessChess	Mar 6, 2014
Mridul Muralidharan	Aug 17, 2013
Sidonia	May 19, 2016
Witchess	Apr 22, 2015

Up one Level

Zappa

GerdIsenberg — Tue, 24 Oct 2017 18:58:11 GMT

Home * Engines * Zappa

		Zappa, a world class UCI compliant chess program developed by Anthony Cozzie. Zappa won the WCCC 2005 in Reykjavík ^[1] , and after the Rybka disqualification in 2011 the WCCC 2007 in Amsterdam, the DOCCC 2005 and CCT7.During the World Chess Championship 2007 in Mexico City, September 2007, Zappa played a match versus Rybka and scored 5.5 / 10 to win the match ^[2] ^[3] ^[4] . Zappa's book authors for different events were Arturo Ochoa (CCT7) and Erdogan Günes ^[5] .
Strictly Commercial ^[6] ^[7] ^[8]

Photos

^[9]



Anthony Cozzie before round 7, Zappa - Junior, WCCC 2005 ^[10]

Zappa Team, Anthony Cozzie and Erdogan Günes, Closing Dinner WCCC 2006, Turin

Genealogy

Zappa is not directly named for Frank Zappa, but from a scene from Austin Powers 2, where Dr. Evil's base in the moon is divided in two units: Moon Unit Alpha and Moon Unit Zappa - the latter being the name of Frank Zappa's daughter, Moon Unit Zappa ^[11] .

Strictly Commercial

Immediately after the successful WCCC 2005, there were plans to commercialize Zappa. First attempts with Vincent Diepeveen involved failed ^[12] . In April 2006 ^[13] , a commercial version dubbed Zap!Chess running under the Fritz GUI was released by ChessBase ^[14] . The version which played the Rybka match, Zappa Mexico, is distributed by Stefan Meyer-Kahlen ^[15] .

Quote from No Commercial Potential : The Saga of Frank Zappa (1972) by David Walley, p. 4 ^[16] ^[17] ^[18] :

Jawaka	`Information is not knowledge` `Knowledge is not wisdom` `Wisdom is not truth` `Truth is not beauty` `Beauty is not love` `Love is not music` `Music is the best`

Program Internals

Board Representation

Zappa utilizes bitboards and uses rotated bitboards to generate sliding attacks on the fly. Anthony once experimented with incremental updated attack tables, which was a win on 32-bit systems ^[19] .

Hash Collisions

Excerpt from The Effect of Hash Signature Collisions in a Chess Program, that is Crafty and Zappa ^[20] :

Both programs are traditional computer chess programs that use the alpha/beta algorithm to search a minimax game tree. The search is done in three distinct phases.

Phase 1 is the normal full-width search that is done to some fixed depth as limited by the total time allowed for a move. This fixed-depth search is modified by various search extensions.

Phase 2 is an add-on search done after the basic search has reached a satisfactory depth. Phase 2 only considers captures in Crafty, while Zappa also includes some checking moves.

Phase 3 is the static evaluation, which takes the current position after phase 2 has completed, and computes a numerical score based on the material, the locations of the pieces, pawn structure, and many other positional considerations. In Crafty/Zappa, all of the hashing is done in phase1 of the search, there is no hashing in the quiescence search.

Singular Extensions

Zap!Chess, the commercial ChessBase version, has an implementation of Singular Extensions, the famous Deep Blue search algorithm. They are disabled by default, but they increase the tactical strength of the program at the cost of positional strength ^[21] .

Parallel Search

Zappa was designed to run on multiple processors and massive parallel systems using shared memory and threads and has an efficient parallel search ^[22] . Zappa Mexico can be used on Windows or Linux computers with up to 512 CPU cores.

100% Finished

In March 2008 Anthony Cozzie announced that "the Zappa project is 100% finished", which includes both tournaments and future releases ^[23] .

Rondo

In 2010, Zach Wegner started to work with Anthony Cozzie, who, still in computer chess retirement, has given control for further development of his massive parallel program, now called Rondo, to Zach ^[24] ^[25] .

Publications

The Editor (2005). ZAPPA Wins the Computer-Chess Tournament 7. ICGA Journal, Vol. 28, No. 2 » CCT7
Robert Hyatt, Anthony Cozzie (2005). The Effect of Hash Signature Collisions in a Chess Program. ICGA Journal, Vol. 28, No. 3
Anthony Cozzie (2007). Zappa vs. Rybka. ICGA Journal, Vol. 30, No. 4
Monty Newborn (2011). Beyond Deep Blue: Chess in the Stratosphere. Springer, ISBN-13: 978-0857293404, amazon

Chapter 9: 2005: Zappa Red Hot at 13th WCCC, page 119
Chapter 14: 2007: Zappa Upsets Rybka in Mexico City, 5.5–4.5, page 169

Forum Posts

2003

Zappa CCT5 Report by Anthony Cozzie, CCC, January 21, 2003 » CCT5

2004

Zappa @ CCT6 by Anthony Cozzie, CCC, February 01, 2004 » CCT6
The Zappa Attack Table Code by Anthony Cozzie, CCC, May 05, 2004

2005 ...

Zappa 1.0 released by Volker Pittlik, CCC, February 22, 2005
Zappa - TCB 1-0 by Anthony Cozzie, CCC, August 14, 2005 » WCCC 2005
Sjeng-Zappa by Anthony Cozzie, CCC, August 14, 2005
FUTE-Zappa by Anthony Cozzie, CCC, August 15, 2005
Zappa=Fruit live by Anthony Cozzie, CCC, August 15, 2005
Zappa - Jonny 1-0 by Anthony Cozzie, CCC, August 16, 2005
The Baron - Zappa 0-1 by Anthony Cozzie, CCC, August 18, 2005
Zappa - Junior by Anthony Cozzie, CCC, August 19, 2005
Zappa-Isichess by Anthony Cozzie, CCC, August 19, 2005
Shredder-Zappa by Anthony Cozzie, CCC, August 20, 2005
Zappa - Crafty by Anthony Cozzie, CCC, August 20, 2005
Diep-Zappa by Anthony Cozzie, CCC, August 21, 2005
Zappa scaling #s by Anthony Cozzie, CCC, August 23, 2005
Zappa web update & a few other things by Anthony Cozzie, CCC, August 27, 2005
Zappa commercial and available in september by Thomas Logan, CCC, August 27, 2005
Re: Zappa Retail: No UCI? by Anthony Cozzie, CCC, September 04, 2005
Zappa UCI: You are all a bunch of HYPOCRITES by Gian-Carlo Pascutto, CCC, September 04, 2005
I will not buy Zappa and Sjeng by Sandro Necchi, CCC, September 06, 2005
Zappa 1.1 by Ernst Walet, CCC, September 14, 2005
Re: what do we know about zappa by Anthony Cozzie, CCC, December 12, 2005
Zappa Hardware Upgrade by Anthony Cozzie, CCC, December 23, 2005
Zappa Report by Anthony Cozzie, CCC, December 30, 2005 » IPCCC 2005 b
Re: Zappa Report by Ingo Althöfer, CCC, December 30, 2005 ^[26]

2006

Zappa? by James T. Walker, CCC, January 27, 2006

2007

Zappa Mexico UCI going commercial by Kaj Soderberg, CCC, September 09, 2007
Zappa V Rybka Mexico 2007 - Zappa wins 5.5-4.5 - The Games by Harvey Williamson, Hiarcs Forum, September 27, 2007

2008 ...

bad news from zappa ... by Powell, CCC, Mar 09, 2008

2010 ...

info about zappa on 512 cores ? by Daniel Shawul, CCC, June 23, 2012
Threads-Test - SF, Zappa, Komodo - 1 vs. 2, 4, 8, 16 Threads by Andreas Strangmüller, CCC, May 04, 2014 » Thread, Stockfish, Zappa, Komodo
Threads factor: Komodo, Houdini, Stockfish and Zappa by Andreas Strangmüller, CCC, May 17, 2014 » Thread, Komodo, Houdini, Stockfish, Zappa

2015 ...

Empirical results with Lazy SMP, YBWC, DTS by Kai Laskos, CCC, April 16, 2015 » Lazy SMP, YBWC, DTS
What is the secret of Zappa? by Frank Quisinsky, CCC, September 11, 2016

External Links

Zappa Chess

Zappa

Frank Zappa from Wikipedia
Moon Zappa from Wikipedia
Dweezil Zappa from Wikipedia
Frank Zappa - Wikiquote
The Mothers of Invention from Wikipedia
Zappanale from Wikipedia
Zappa Wiki Jawaka!
(3834) Zappafrank (Planet)
3834 Zappafrank from Wikipedia
The Planet Zappafrank
Pachygnatha Zappa
Zappa confluentus - "A Fish Called Zappa"
Berlin Names Street After Frank Zappa, The Washington Post, July 30, 2007
Frank Zappa - Cosmik Debris, YouTube Video
Frank Zappa, Jean-Luc Ponty, George Duke, Tom Fowler, Bruce Fowler, Ruth Underwood, Ian Underwood, Ralph Humphrey
Frank Zappa - Illinois Enema Bandit ^[28] , YouTube Video
Frank Zappa, Ray White, Steve Vai, Tommy Mars, Bobby Martin, Ed Mann, Scott Thunes, Chad Wackerman
Frank Zappa - Whippin' Post, live at "The Pier", New York City, 26th August 1984, YouTube Video
Frank Zappa, Ray White, Ike Willis, Bobby Martin, Allan Zavod, Scott Thunes, Chad Wackerman

References

^ WCCC 2005 Photojournal by Anthony Cozzie
^ WM Mexiko-City 2007: 108 Bilder, Namen, Themen, kommentiert, ... (German) Chess Tigers News October 08, 2007
^ Zappa fillets the Fish: Mexico 2007 by Anthony Cozzie
^ Anthony Cozzie (2007). Zappa vs. Rybka. ICGA Journal, Vol. 30, No. 4
^ Zappa Chess Engine
^ Strictly Commercial from Wikipedia
^ Strictly Commercial: The Best of Frank Zappa - Frank Zappa | AllMusic
^ Strictly Commercial - Zappa Wiki Jawaka
^ By Gerd Isenberg
^ Zappa - Junior by Anthony Cozzie, CCC, August 19, 2005
^ Zappa Chess Engine - Genealogy
^ Re: Zappa Retail: No UCI? by Anthony Cozzie, CCC, September 04, 2005
^ World Computer Chess Champion: Zap!Chess, ChessBase News, April 13, 2006
^ ChessBase Shop - Zap!Chess
^ Zappa Mexico from shredderchess.com
^ No Commercial Potential: The Saga Of Frank Zappa
^ Frank Zappa - Wikiquote
^ No Commercial Potential: The Saga of Frank Zappa - Zappa Wiki Jawaka
^ The Zappa Attack Table Code by Anthony Cozzie, CCC, May 05, 2004
^ Robert Hyatt, Anthony Cozzie (2005). The Effect of Hash Signature Collisions in a Chess Program. ICGA Journal, Vol. 28, No. 3
^ World Computer Chess Champion: Zap!Chess, ChessBase News, April 13, 2006
^ Zappa scaling #s by Anthony Cozzie, CCC, August 23, 2005
^ bad news from zappa ... by Powell, CCC, Mar 09, 2008
^ Zach, is this true? by Gabor Szots, CCC, June 06, 2010
^ Zappa's ICGA Tournaments
^ Ingo Althöfer (1993). On Telescoping Linear Evaluation Functions. ICCA Journal, Vol. 16, No. 2, pp. 91-94
^ Erwin l'Ami from Wikipedia
^ Michael H. Kenyon from Wikipedia

What links here?

Page	Date Edited
Andreas Strangmüller	May 15, 2017
Anthony Cozzie	Nov 5, 2016
Arturo Ochoa	May 4, 2017
Automated Tuning	Feb 27, 2018
CCT Tournaments	Jan 29, 2017
CCT10	May 5, 2013
CCT5	Feb 22, 2013
CCT6	May 29, 2014
CCT7	Dec 16, 2017
CCT8	Apr 6, 2013
CCT9	Aug 25, 2013
ChessBase	Nov 25, 2017
Daniel Mehrmann	Dec 13, 2015
Deep Fritz versus Deep Junior 2007	Oct 15, 2016
DOCCC 2005	Aug 15, 2015
Dutch Open Computer Chess Championship	Sep 25, 2014
Eigenmann Endgame Test	Jun 1, 2017
Engines	Mar 10, 2018
Erdogan Günes	Jul 7, 2017
Fabien Letouzey	Feb 5, 2018
Fritz Reul	Nov 28, 2016
Fruit	Sep 27, 2016
Futé	Apr 13, 2017
Helmut Weigel	Dec 2, 2017
Houdini	Apr 14, 2018
ICGA Journal	Dec 21, 2017
ICT 2007	Sep 14, 2015
IPCCC 2005 b	Apr 15, 2013
Jos Uiterwijk	Aug 11, 2017
King of Kings	Sep 4, 2013
Komodo	Mar 6, 2018
Kramnik versus Deep Fritz 2006	Nov 28, 2017
Loop (Program)	Mar 14, 2017
Maarten Schadd	Jan 2, 2017
Mathematician	Apr 9, 2018
Parallel Search	Dec 30, 2017
Peter Berger	Feb 29, 2016
Rondo	Jan 7, 2016
Rybka Controversy	Jan 18, 2018
Shannon Trophy	Jul 7, 2017
Stockfish	Apr 7, 2018
Thread	Apr 22, 2018
University of Illinois at Urbana-Champaign	Oct 12, 2016
Volker Pittlik	Sep 4, 2013
WCCC 2005	Dec 27, 2016
WCCC 2006	Jan 28, 2018
WCCC 2007	Jan 2, 2017
WCRCC 2007	Nov 21, 2016
Who's Who	Sep 6, 2017
World Computer Chess Championship	Mar 6, 2018
Yngvi Björnsson	Jun 26, 2017
Zach Wegner	Jan 7, 2016
Zappa	Oct 24, 2017
Zappa versus Rybka 2007	Nov 25, 2017

Up one level

Zeus RU

GerdIsenberg — Sat, 06 Jun 2015 11:41:50 GMT

Home * Engines * Zeus RU

		Zeus, a Winboard compatible chess engine written by Vadim Bykov in C, first released in November 2004. It performs iterative deepening with aspiration windows and transposition table along with null move pruning, futility and extended futility pruning, check and singular extensions. Move ordering is improved by killer and history heuristic, as well as SEE to determine winning and equal captures. The evaluation has smooth transitions between game phases, and beside material and bad trades, focuses on king safety and (unstoppable) passed pawns ^[1]. Zeus had its over the board debut at the CCCCISC 2008.
Zeus faber ^[2]

Namesake

Zeus by Gerardo Castaño Recio

Forum Posts

New engine from Russia... by Leo Dijksman, Winboard Forum, November 14, 2004
New version Zeus 1.04 by Vadim Bykov! by Serge, Winboard Forum, December 19, 2004
New Zeus 1.13! by Serge, Winboard Forum, April 11, 2005

External Links

Chess Engine

Misc

References

^ Zeus 1.25 history
^ Zeus faber, photo by Kleines.Opossum, June 22, 2006, Zeus (fish) from Wikipedia, Wikimedia Commons

What links here?

Page	Date Edited
CCCCISC 2008	Jan 19, 2014
Engines	Mar 10, 2018
Vadim Bykov	Jun 6, 2015
Zeus	Jan 3, 2018
Zeus RU	Jun 6, 2015

Up one Level

Wikispaces : chessprogramming - items matching description

asmFish

Table of Contents

See also

Forum Posts

2015

2016

2017 ...

External Links

Chess Engine

Misc

References

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Brainfish

Table of Contents

See also

Forum Posts

External Links

References

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CCCP (US)

Table of Contents

Selected Games

The Computer Was a Fish

Namesake

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Publications

External Links

References

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CFish

Table of Contents

See also

Forum Posts

2016

2017 ...

External Links

References

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Dorky

Table of Contents

Features

Selected Games

CCT2

CCT6

See also

Forum Posts

2003

2011

2016

External Links

Chess Engine

Misc

References

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DroidFish

Table of Contents

Images

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External Links

Chess Program

Misc

References

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Fischerle

Table of Contents

Technology

Performance

Latest Version

Etymology

Auto-da-Fé

Publications

Fischers Fritz

See also

Forum Posts

2014

2015 ...

External Links

Chess Engine