Houdini,
a chess engine by Robert Houdart, which appeared in 2010 as closed source engine, free for non-commercial use. In January 2011, Houdini 1.5 was leading Ingo Bauer'sIPONrating list[1] . Houdini 2, released in September 2011, is commercial and bundled with a number of ChessOK products, such as Aquarium, Chess Assistant[2], and since December 2011, Chess King[3]. Houdini 1.5a remains available as a free download [4]. Houdini 3, released in October 2012, has further improved by more than 50 Elo points [5] . According to its author, Houdini 3 applies a accelerated principal variation search, also dubbed "Smart" Fail-High. If a different move becomes best at very high search depths at the root, re-searches to determine its exact score and the new principal variation are done faster due to a reduced search depth, presumably in conjunction with extensions along the PV [6] . Since November 2012, Houdini 3 is available as ChessBase engine [7] . Houdini 4, released in November 2013, was about 50 Elo stronger than its predecessor, and features 6-men Syzygy bases.
Released about three years after the previous version, in November 2016, Houdini 5 is vastly improved being about 200 Elo stronger than Houdini 4. It has a completely rewritten evaluation with more aggressive king safety and sophisticated piece mobility, features a more selectivesearch, exploring critical variations significantly deeper, and for hardware with multiple processors, Lazy SMP. Houdini 5 Pro supports up to 128 threads, up to 128 GiB of hash memory, large memory pages, NUMA-architecture, and Nalimov tablebases to find the shortest path to mate.
A development version of Houdini 5 qualified for TCEC Season 9 Superfinal, and even won the TCEC Season 9 Rapid tournament. The final release version of Houdini 5 is about 30 Elo stronger than the engine that played in the TCEC tournament so far. But that was apparently not enough for Stockfish 8 in long time control matches - Houdini 5 lost the 100 game Superfinal with 45½ - 54½.
Houdini 6
Released in September 2017, Houdini 6 again improved in search and evaluation to add another 50-60 Elo in strength, which roughly corresponds to doubling the computational power of the computer [9]. Houdini 6.03 won the TCEC Season 10 Superfinal versus Komodo 1970.00, a successor of Komodo 11, with 53 - 47 (+15=76-9) [10][11].
Houdini's Origin
Robert Houdart claims his engine is original [12] , and admits taking ideas from the open source programs Ippolit/Robbolito, Stockfish and Crafty[13] . Other programmers and forum members raised suspicions that Robert took ideas from the controversial Ippolit/Robbolito source code too literally as initial base of his program [14][15][16][17] .
Sources of Inspiration
Robert Houdart on the origins of Houdini in CCC, June 08, 2010 [18]
From the start I have very clearly acknowledged the different sources of inspiration for Houdini (Ippo/Robbo, Stockfish and Crafty) and have shown every respect for the hard work of others, be it on my web site, in the readme file, or in this forum...
Houdini and the Ippo family have lots of high-level similarities, but zillions of low-level subtle differences.
Claims have been made that I "just changed a couple of resource strings", "made a cheap compile" or "grabbed some free code", but, in truth, none of you have any clue about the effort that was invested in Houdini.
It is funny that I would not be called a "real" chess engine author, when I am both a professional software developer and a reasonably strong chess player (peak 2280 rating), who has been writing chess engines for over 25 years now in a variety of programming languages.
It is sad that on the one hand you request that everybody demonstrates respect for the hard work of others, but on the other hand you seem to be unable to extend the same courtesy (or even the benefit of the doubt) to Houdini.
Material Table
The idea to index the material table in the same manner as Robbolito, with combined counters of queens, rooks, light and dark bishops, knights and pawns, and to calculate piece counters from that table-index by a sequence of mod/div operations by {2,2,3,3,2,2,2,2,3,3,9,9} might be considered obvious after studying the mentioned source code, and if applying that scheme, there is hardly anything to avoid a sequence of almost identical x86 machine code with same constants for reciprocal multiplication[19] .
Strelka 5 is Houdini 1.5 RE, not Houdini 2. I share your fears, any #1 engine will be RE'd in a matter of months. For Houdini 1.5 it's taken about 6 months.
You mean 6 months until Strelka has been released to public. You do not know how much time did Yuri Osipov spent on RE, neither when he did start his RE project. For me it took barely one week. As Milos S. pointed out[22] , you made RE very very easy because of starting your project from Robbolito codebase... Personally I see no problem with that (other than you not telling the truth).
a chess engine by Robert Houdart, which appeared in 2010 as closed source engine, free for non-commercial use. In January 2011, Houdini 1.5 was leading Ingo Bauer's IPON rating list [1] . Houdini 2, released in September 2011, is commercial and bundled with a number of ChessOK products, such as Aquarium, Chess Assistant [2], and since December 2011, Chess King [3]. Houdini 1.5a remains available as a free download [4]. Houdini 3, released in October 2012, has further improved by more than 50 Elo points [5] . According to its author, Houdini 3 applies a accelerated principal variation search, also dubbed "Smart" Fail-High. If a different move becomes best at very high search depths at the root, re-searches to determine its exact score and the new principal variation are done faster due to a reduced search depth, presumably in conjunction with extensions along the PV [6] . Since November 2012, Houdini 3 is available as ChessBase engine [7] . Houdini 4, released in November 2013, was about 50 Elo stronger than its predecessor, and features 6-men Syzygy bases.
Table of Contents
Houdini 5
Released about three years after the previous version, in November 2016, Houdini 5 is vastly improved being about 200 Elo stronger than Houdini 4. It has a completely rewritten evaluation with more aggressive king safety and sophisticated piece mobility, features a more selective search, exploring critical variations significantly deeper, and for hardware with multiple processors, Lazy SMP. Houdini 5 Pro supports up to 128 threads, up to 128 GiB of hash memory, large memory pages, NUMA-architecture, and Nalimov tablebases to find the shortest path to mate.A development version of Houdini 5 qualified for TCEC Season 9 Superfinal, and even won the TCEC Season 9 Rapid tournament. The final release version of Houdini 5 is about 30 Elo stronger than the engine that played in the TCEC tournament so far. But that was apparently not enough for Stockfish 8 in long time control matches - Houdini 5 lost the 100 game Superfinal with 45½ - 54½.
Houdini 6
Released in September 2017, Houdini 6 again improved in search and evaluation to add another 50-60 Elo in strength, which roughly corresponds to doubling the computational power of the computer [9]. Houdini 6.03 won the TCEC Season 10 Superfinal versus Komodo 1970.00, a successor of Komodo 11, with 53 - 47 (+15=76-9) [10] [11].Houdini's Origin
Robert Houdart claims his engine is original [12] , and admits taking ideas from the open source programs Ippolit/Robbolito, Stockfish and Crafty [13] . Other programmers and forum members raised suspicions that Robert took ideas from the controversial Ippolit/Robbolito source code too literally as initial base of his program [14] [15] [16] [17] .Sources of Inspiration
Robert Houdart on the origins of Houdini in CCC, June 08, 2010 [18]Houdini and the Ippo family have lots of high-level similarities, but zillions of low-level subtle differences.
Claims have been made that I "just changed a couple of resource strings", "made a cheap compile" or "grabbed some free code", but, in truth, none of you have any clue about the effort that was invested in Houdini.
It is funny that I would not be called a "real" chess engine author, when I am both a professional software developer and a reasonably strong chess player (peak 2280 rating), who has been writing chess engines for over 25 years now in a variety of programming languages.
It is sad that on the one hand you request that everybody demonstrates respect for the hard work of others, but on the other hand you seem to be unable to extend the same courtesy (or even the benefit of the doubt) to Houdini.
Material Table
The idea to index the material table in the same manner as Robbolito, with combined counters of queens, rooks, light and dark bishops, knights and pawns, and to calculate piece counters from that table-index by a sequence of mod/div operations by {2,2,3,3,2,2,2,2,3,3,9,9} might be considered obvious after studying the mentioned source code, and if applying that scheme, there is hardly anything to avoid a sequence of almost identical x86 machine code with same constants for reciprocal multiplication [19] .Strelka 5
Robert Houdart on Strelka 5, December 04, 2011 [20]Release Dates
See also
Publications
Harry Houdini
Harry Houdini (2007). The Right Way to Do Wrong. Librivox audio recording from the Internet Archive
Chess Engine
Forum Posts
2010 ...
- Re: Costeff Study 1979 by Robert Houdart, CCC, May 16, 2010
- Houdini - a cheap compile of Ippo/Robo by Lance Perkins, CCC - Computer Chess Club: Engine Origins, May 29, 2010 (requires login)
- Re: question on draw evaluation by Robert Houdart, CCC, June 07, 2010 » Draw Evaluation
- Houdini 1.03 is available by Robert Houdart, CCC, July 15, 2010
- Re: Mate in 17 revisited by Robert Houdart, CCC, July 16, 2010 » Zugzwang
- Houdini 1.03a bug-fix is available by Robert Houdart, CCC, July 17, 2010
- Houdini 1.03a tests by Harun Taner, CCC, July 18, 2010
- Why Is Houdini Not Entered In The WCCC?? by Sean Evans, Open Chess Forum, August 03, 2010
- Re: Plain and fancy magic on modern hardware by Robert Houdart, CCC, August 26, 2010 » Magic Bitboards
- Gaviota EGTB in Houdini 1.5 + contacting Eugene Nalimov by Robert Houdart, CCC, December 01, 2010
- Houdini 1.5 is released by Robert Houdart, CCC, December 15, 2010
- Houdini 1.5 with Large Page support and 8-cores for w32 by Robert Houdart, CCC, December 19, 2010
- Houdini 1.5: one mystery/question by Jouni Uski, CCC, December 21, 2010
- Houdini and Chessbase GUI engine matches by Robert Houdart, CCC, December 27, 2010
2011- Houdini Engine Origins by Jeremy Bernstein, OpenChess Forum, January 18, 2011
- a Telltale position by Larry Kaufman, CCC, 12 February, 2011
- Re: Why are the Ippo derivative stronger than Stockfish? by Richard Vida, CCC, 25 February, 2011
- Re: Hash usage percent display (in Arena) by Robert Houdart, CCC, March 24, 2011
- Re: Houdini, Fire, IvanHoe, (and Rybka?) are 'clones'...? by Jury Osipov, CCC, May 12, 2011
- Some news about Houdini 2.0 by Robert Houdart, CCC, July 22, 2011
- Houdini 2 is released by Robert Houdart, CCC, September 02, 2011
- Houdini 2 Aquarium released by Robert Houdart, CCC, October 09, 2011
- Computer Chess Biggest Liar by kingliveson, OpenChess Forum, October 09, 2011
- how far is too far: houdini for sell? by Joseph, CCC, October 11, 2011
- Houdini with 1:1 Robbolito-code? by Dr. Alexander Schmidt, CCC, October 12, 2011
- Strelka 5 by Yuriy Osipov by Slavik Pavloff, CCC, October 15, 2011 » Strelka
- New:Houdini 2 Chess Benchmarks are Acceptable! by Sedat Canbaz, CCC, November 26, 2011
- Re: Any plans for Houdini 3? by Robert Houdart, CCC, December 03, 2011
- Re: Komodo 4 on long time control by Richard Vida, CCC, December 04, 2011 » Komodo, Strelka
- Houdini 2.0c - Mate in 1 bug by Árpád Rusz, CCC, December 08, 2011
2012Re: Houdini with 1:1 Robbolito-code? by Norman Schmidt, CCC, October 12, 2011
- Re: Interesting poll by Rebel, Rybka Forum, July 15, 2012
- Houdini 3 reducing the depth feature by Maurizio Maglio, CCC, October 17, 2012
- Houdini 3 does not behave the same in 64-bit and 32-bit by Ernest Bonnem, CCC, October 23, 2012
- houdini3 search and mate scores by Uri Blass, CCC, October 29, 2012 » Mate Scores
- Houdini 3 update does behave the same in 64-bit and 32-bit by Ernest Bonnem, CCC, November 01, 2012
- What is stronger than Houdini 3 for what? by S.Taylor, CCC, November 11, 2012
- Houdini 3 tests (8cpu) by Harun Taner, CCC, November 12, 2012
- The scaling of Houdini 3 and Komodo 5 by Kai Laskos, CCC, November 16, 2012 » Komodo
- Houdini 3-Houdini 3: Nutzen der Bedenkzeitverlängerung by Patrick Götz, CSS-Forum, December 07, 2012 (German) » Diminishing Returns
- Houdini 3 the same in 64-bit and 32-bit: well, not quite? by Ernest Bonnem, CCC, November 28, 2012
2013- 10 Lessons to be Learned from todays Top Engines by Josef, Rybka Forum, January 03, 2013 » Komodo, Stockfish
- eval scale in Houdini by Rein Halbersma, CCC, January 14, 2013 » Evaluation
- Scaling at 2x nodes (or doubling time control) by Kai Laskos, CCC, July 23, 2013 » Doubling TC, Diminishing Returns, Playing Strength, Houdini
- Houdini 4 has been released by Robert Houdart, CCC, November 25, 2013
- Houdini, much weaker engines, and Arpad Elo by Kai Laskos, CCC, November 29, 2013 » Match Statistics, Pawn Advantage, Win Percentage, and ELO [25]
- IPON results for Houdini 4 by Robert Houdart, CCC, December 02, 2013 » IPON
- Be careful where you buy Houdini 4, or you could get burned by Tom Likens, CCC, December 05, 2013
20142015 ...
- Empirical results with Lazy SMP, YBWC, DTS by Kai Laskos, CCC, April 16, 2015 » Lazy SMP, YBWC, DTS
2016- Houdini 5 in TCEC by John Wentworth, CCC, April 13, 2016 » TCEC Season 9 [26]
- Houdini 5 dev in TCEC by Jouni Uski, CCC, September 08, 2016 » TCEC Season 9
- New Houdini by Dann Corbit, CCC, October 05, 2016
- Houdini 5 has been released by Robert Houdart, CCC, November 09, 2016
- chessbase houdini is out but... by Stavros Atmatzidis, CCC, December 03, 2016
2017- Houdini 6 has been released by Robert Houdart, CCC, September 18, 2017
- Scaling from FGRL results with top 3 engines by Kai Laskos, CCC, September 26, 2017 » FGRL, Komodo, Stockfish
2018External Links
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Harry Houdini
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