Older Version
Newer Version
GerdIsenberg
Mar 27, 2017
**[[Home]] * [[Engines]] * Rybka**
|| [[image:http://rybkachess.com.www52.your-server.de/RYBKA-worlds-strongest-chess-engine-UCI-best-chess-UCI-software-greatest-chess-engine-software-UCI-top-chess-software-engine-UCI/1.png link="http://rybkachess.com.www52.your-server.de/index.php?auswahl=Purchase+Rybka"]] ||~ || **Rybka**,
a chess engine by primary author [[Vasik Rajlich]], since 2007 dominating and reigning [[World Computer Chess Championship|World Computer Chess Champion]] and holder of the [[Shannon Trophy]], winning the [[WCCC 2007]] <ref>[[http://www.game-ai-forum.org/icga-tournaments/news_item.php?id=25|Bulletin Day 7 WCCC 2007 (ICGA Tournaments)]]</ref> , [[WCCC 2008]], [[WCCC 2009]] and [[WCCC 2010]], but in June 2011 [[Rybka#Disqualification|disqualified]] by the [[ICGA]] from all previous and future World Computer Chess Championships <ref>* [[http://www.chessvibes.com/?q=reports/rybka-disqualified-and-banned-from-world-computer-chess-championships|Rybka disqualified and banned from World Computer Chess Championships | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], June 29, 2011</ref> . Rybka further won various [[IPCCC]], [[Dutch Open Computer Chess Championship|Dutch Open Computer Chess Championships]], [[International CSVN Tournament|International CSVN Tournaments]] and on-line tournaments such as [[CCT Tournaments]] and [[ACCA Americas' Computer Chess Championship|ACCA Americas' Computer Chess Championships]]. Rybka is a standalone chess engine supporting the [[UCI]] protocol. ||
|| Rybka 4 Logo <ref>[[http://rybkachess.com.www52.your-server.de/index.php?auswahl=Purchase+Rybka|Rybka - for the serious chess player - Purchase Rybka]]</ref> ||~ ||^ ||
[[toc]]
=Screenshots=
|| [[image:http://www.chessbase.com/news/2010/rybka4-04.jpg link="http://www.chessbase.com/newsdetail.asp?newsid=6382"]] ||
|| [[ChessBase (Database)#GUI|ChessBase GUI]], 3D boards with scoresheet and analysis board <ref>[[http://www.chessbase.com/newsdetail.asp?newsid=6382|Rybka 4 is here – and stronger than ever]], [[ChessBase|ChessBase News]], May 31, 2010</ref> ||
||~ ||
|| [[image:DeepRybkaInAqurium7.png width="480" height="364" link="http://chessok.com/shop/index.php?main_page=product_info&cPath=7_1&products_id=344"]] ||
|| Deep Rybka 4 [[Aquarium]] by [[ChessOK]] <ref>[[http://chessok.com/shop/index.php?main_page=product_info&cPath=7_1&products_id=440|ChessOK, Chess Shop from the Developers of Rybka 3 Aquarium]]</ref> ||
=Team=
The Rybka team consists of primary author and [[http://en.wikipedia.org/wiki/International_Master#International_Master_.28IM.29|International Master]] [[Vasik Rajlich]], supported by [[http://en.wikipedia.org/wiki/Grandmaster_%28chess%29|Grandmaster]] and [[Evaluation|evaluation]] expert [[Larry Kaufman]] (Rybka 3), Rybka's main tester and [[http://en.wikipedia.org/wiki/International_Master#Woman_Grandmaster_.28WGM.29|Women's GM (WGM)]] and IM [[Iweta Rajlich]], the [[Opening Book Authors|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// <ref>[[http://rybkachess.com.www52.your-server.de/index.php?auswahl=Rybka+team|Rybka - for the serious chess player - Rybka team]]</ref> .
=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// <ref>[[http://www.stmintz.com/ccc/index.php?id=465686|Rybka 1.0 beta release - need testers]] by [[Vasik Rajlich]], [[CCC]], November 30, 2005</ref> <ref>[[http://www.chess.com/download/view/rybka-beta-10|Rybka Beta 1.0 - Chess.com]]</ref> <ref>[[http://forums.ubi.com/groupee/forums/a/tpc/f/760105752/m/6551055383/r/9271018383|New Chess Engine - Rybka v 1.0 Beta Readme, Dec 4, 2005]]</ref> and the first commercial version, //Rybka 1// <ref>[[http://www.stmintz.com/ccc/index.php?id=466792|Rybka 1.0 Announcement]] by [[Vasik Rajlich]], [[CCC]], December 05, 2005</ref> end of 2005 was a sensation, and Rybka soon became the dominating program leading [[Engine Rating Lists|rating lists]] by a huge margin <ref>[[http://ssdf.bosjo.net/list.htm|The SSDF Rating List]]</ref> <ref>[[http://www.husvankempen.de/nunn/40_120_ratinglist/Quad/qratinglist.html|CEGT Quad Versions 40/120 (AMD 3500+/4200+)]]</ref> . //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 <ref>[[http://www.rybkachess.com/index.php?auswahl=Purchase+Rybka|Rybka - for the serious chess player - Purchase Rybka]]</ref> , from [[ChessOK]] optional with the [[Aquarium]] [[GUI]] <ref>[[http://chessok.com/shop/index.php?main_page=index&cPath=7_1|Rybka & Aquarium - ChessOK shop]]</ref> , or from [[ChessBase]] packaged with the [[Fritz]] [[GUI]] <ref>[[http://www.chessbase.com/shop/product.asp?pid=506|Chess software - Rybka 4]] from [[ChessBase]]</ref> . The demo version //Rybka 2.3.2a// can be downloaded for free <ref>[[http://www.rybkachess.com/index.php?auswahl=Demo+version|Rybka - for the serious chess player - Download Rybka 2.3.2a]]</ref> .
=Achievements=
<ref>[[http://www.chessvibes.com/?q=reports/rybka-disqualified-and-banned-from-world-computer-chess-championships|Rybka disqualified and banned from World Computer Chess Championships | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], June 29, 2011</ref>
||~ 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 [[Bitboards|bitboard]] engine, first versions [[Rotated Bitboards|rotated]], Rybka 4 apparently [[Magic Bitboards|magic bitboards]] for [[Sliding Piece Attacks|sliding piece attack]] and [[Move Generation|move generation]]. Vasik once posted a snippet of Rybka source-code, a typical [[Bitboard Serialization|bitboard serialization]] loop to generate white knight captures <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=20132#pid20132|re: rybka source code]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], July 24, 2007</ref> .
[[code format="cpp"]]
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;
}
}
[[code]]
Due to the disputed [[Open Source Engines|open source engines]] [[Strelka|Strelka 2.0]] and later [[Ippolit]], which accordant to Vasik Rajlich were both based on or heavily influenced by re-engineered Rybka executables <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006|Strelka 2.0]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008</ref> <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=34908|My recent correspondence with Vasik Rajlich]] by [[Sven Schüle]], [[CCC]], June 13, 2010</ref> , other implementation details were released to the public, such as [[Material Tables|material-]] and material imbalance tables, aggressive [[Late Move Reductions|LMR]], [[Razoring|razoring]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006;pg=4|Re: Strelka 2.0 pg 4]] by [[Anthony Cozzie]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008</ref> and some variation of [[Singular Extensions|singular extensions]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=14574|A question to Larry Kaufman]], by Erik, [[Computer Chess Forums|Rybka Forum]], December 30/31, 2009</ref> . [[Zach Wegner]] elaborated on [[Evaluation|evaluation]] issues, and compared //Rybka 1 beta// with [[Fruit|Fruit's]] evaluation <ref>[[https://webspace.utexas.edu/zzw57/rtc/eval/eval.html|Rybka/Fruit: evaluation]] by [[Zach Wegner]]</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=301#p2658|Re: What do you folks make of this ?]] by [[Chris Whittington]], [[Computer Chess Forums|OpenChess Forum]], June 27, 2010</ref> , continued by former anonymous author "BB+" alias [[Mark Watkins]] in February 2011 <ref>[[Mark Watkins]] (**2011**). //A comparison of Rybka 1.0 Beta and Fruit 2.1//, [[http://www.open-chess.org/download/file.php?id=304|pdf, February 24, 2011 Version]]</ref> .
=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 per second|nodes]] and [[Depth|depth]] <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=14959|What Strelka tells about Rybka's nodecount and depth]] by [[Ernest Bonnem]], [[CCC]], July 09, 2007</ref> <ref>[[http://www.johnljerz.com/superduper/tlxdownloadsiteMAIN/id18.html|Does Rybka Properly Count Positions Evaluated?]] by [[John L. Jerz]]</ref> <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=23037|To Jeroen and interested minds, re. Tiger node count]] by [[Christophe Théron]], [[CCC]], August 15, 2008</ref> <ref>[[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=328195&t=32335|Re: Question to Larry Kaufman about Rybka]] by [[Larry Kaufman]], [[CCC]], February 05, 2010</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=5&t=1004|Node counting]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 20, 2011</ref> , and the [[http://en.wikipedia.org/wiki/Rybka#Strelka_controversy|controversy]] about [[Strelka]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1655|Strelka = Rybka 1.0]] by DarkAvenger, [[Computer Chess Forums|Rybka Forum]], July 07, 2007</ref> <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006|Strelka 2.0]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008</ref> raised suspicions about the initial origin of Rybka 1.0 <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=23118|Rybka 1.0 vs. Strelka]] by [[Zach Wegner]], [[CCC]], August 19, 2008</ref> <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=23249|Questions for Vas]] by [[Zach Wegner]], [[CCC]], August 25, 2008</ref> , but Vasik Rajlich categorically denied Rybka 1.0 was based on [[Fruit]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=19118#pid19118|Re: Is Rybka a derivative of Fruit?]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], July 14, 2007</ref> <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=6772|question to vas on similarity of rybka 1.0 to fruit]] by duncan, [[Computer Chess Forums|Rybka Forum]], August 25, 2008</ref> , as mentioned by [[Chrilly Donninger]] in 2005 <ref>[[http://www.stmintz.com/ccc/index.php?id=469209|Rybka uses PVS and not MTD(f). Its no Fruit-Clone]] by [[Chrilly Donninger]], [[CCC]], December 12, 2005</ref> after early rumors <ref>[[http://www.stmintz.com/ccc/index.php?id=467208|Is Rybbka a fruit clone?]] by Ziad Haddad, [[CCC]], December 06, 2005</ref> and questions <ref>[[http://www.stmintz.com/ccc/index.php?id=469130| Rybka - How much Fruit is inside?]] by [[Daniel Mehrmann]], [[CCC]], December 11, 2005</ref> arose.
Vasik Rajlich's most quoted statement in these discussions was probably from an interview in //uciengines.de//, December 20, 2005 <ref>[[http://www.top-5000.nl/int/rybka.htm|Interview with Vasik Rajlich]] by [[Christopher Conkie]], [[Michael Diosi]], [[Frank Quisinsky]] & [[Alexander Schmidt]], December 20, 2005, hosted by [[Ed Schroder|Ed Schröder]]</ref> :
|| {{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 Engines|open source program]] by pseudonymous authors in May 2009, and Rajlich's claim it is a [[Clones|clone]] of //Rybka 3// <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=12995|Official statement on [Deleted]?]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 21, 2009</ref> without any substantiation and evidence, caused further discussions <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=30296|I'm in doubt if RobboLito is a clone]] by [[Volker Pittlik]], [[CCC]], October 24, 2009</ref> .
==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 [[Bitboards|bitboard]] re-write of Fruit with some other ideas, and not just an extraction of a couple of ideas <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=37762|Fabien's open letter to the community]] by [[Tord Romstad]], [[CCC]], January 23, 2011</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1014|Fabien's open letter to the community]] by [[Tord Romstad]], [[Computer Chess Forums|OpenChess Forum]], January 23, 2011</ref> <ref>[[http://www.thechessmind.net/blog/2011/1/24/more-computer-chess-controversy.html|The Chess Mind Blog - More Computer Chess Controversy]]</ref> .
On February 19, 2011 [[ICGA]] president [[David Levy]] broached on [[Clones|cloning]] issues in a //ChessVibes// column <ref>[[http://www.chessvibes.com/?q=reports/attack-of-the-clones|Attack of the clones | ChessVibes]] by [[David Levy]], 19 February, 2011</ref> . 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|Fabien Letouzey’s]] program [[Fruit|Fruit 2.1]]:
* [[Fabien Letouzey]]
* [[Zach Wegner]]
* [[Mark Uniacke]]
* [[Stefan Meyer-Kahlen]]
* [[Ed Schroder|Ed Schröder]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22421|In retrospect]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|Rybka Forum]], July 14, 2011</ref> <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22679|Apology to Vas]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|Rybka Forum]], August 17, 2011</ref>
* [[Don Dailey]]
* [[Christophe Théron]]
* [[Richard Pijl]]
* [[Amir Ban]]
* [[Anthony Cozzie]]
* [[Tord Romstad]]
* [[Ralf Schäfer]]
* [[Gerd Isenberg]]
* [[Johannes Zwanzger]]
* [[Shay Bushinsky]]
* [[Volker Böhm]]
The letter was published in the private [[ICGA Investigations|ICGA Investigations Wiki]] <ref>[[icga/home|ICGA Investigations Wiki]]</ref> and elsewhere <ref>[[http://www.chessvibes.com/?q=reports/programmers-write-open-letter-about-rybka-fruit-issue|Programmers write open letter about Rybka-Fruit issue : ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], March 01, 2011</ref> <ref>[[http://www.hiarcs.net/forums/viewtopic.php?t=4038|Open letter to the ICGA about the Rybka-Fruit issue]] by [[Harvey Williamson]], [[Computer Chess Forums|Hiarcs Forum]], March 01, 2011</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1175|Programmers Open Letter to ICGA on Rybka/Fruit]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], March 01, 2011</ref> . The German sites [[http://de.wikipedia.org/wiki/Heise_online|Heise online]] <ref>[[http://www.heise.de/newsticker/meldung/Plagiatsvorwurf-gegen-Computerschach-Weltmeister-1200222.html|Plagiatsvorwurf gegen Computerschach-Weltmeister]], [[http://de.wikipedia.org/wiki/Heise_online|Heise online]], March 01, 2011 (German)</ref> and [[http://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online|Spiegel Online]] broached the issue <ref>[[http://www.spiegel.de/netzwelt/gadgets/0,1518,748616,00.html|Schach-Software Rybka - Programmierer vermuten Intelligenzklau]] by [[http://www.spiegel.de/extra/0,1518,632080,00.html|Frank Patalong]], [[http://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online|Spiegel Online]], March 03, 2011 (German)</ref> .
=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]] <ref>RYBKA 1.6.1 in [[http://www.open-aurec.com/chesswar/Chesswar006/Chesswar006DSt.htm|Chess War V-VII]]</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1175&start=160#p11099|Re: Programmers Open Letter to ICGA on Rybka/Fruit]] by [[Olivier Deville]], [[Computer Chess Forums|Openchess Forum]], March 05, 2011</ref> and //Le Fou numérique// <ref>[[http://americanfoot.free.fr/echecs/suisse/sui/sui3top200.htm|Le Fou numérique - Le Système du Suisse 3 - T]]</ref> , contain a substantial amount of [[Crafty]] code <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1175&start=140#p11066|Re: Programmers Open Letter to ICGA on Rybka/Fruit]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], March 05, 2011</ref> , confirmed by [[Robert Hyatt]] <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1175&start=160#p11081|Re: Programmers Open Letter to ICGA on Rybka/Fruit]] by [[Robert Hyatt]], [[Computer Chess Forums|Openchess Forum]], March 05, 2011</ref> <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=21216|Rybka 1.6.1]] by [[Robert Hyatt]], [[Computer Chess Forums|Rybka Forum]], March 13, 2011</ref> . Beside other evidence there are the known bugs in the old Crafty code (if ms == 99999) <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1175&start=120#p10994|Re: Programmers Open Letter to ICGA on Rybka/Fruit]] by[[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], March 04, 2011</ref> that caused [[Chinito|El Chinito]] by primary author [[Eugenio Castillo Jiménez]] to be exposed as a clone <ref>[[http://www.stmintz.com/ccc/index.php?id=383344|Re: Correction: List and ElChinito as Crafty clones, ... etc]] by [[Paul H]], [[CCC]], August 21, 2004</ref> <ref>[[http://www.stmintz.com/ccc/index.php?id=384790|Open letter by Eugenio Castillo (ELChinito team) ...]] by [[Frank Quisinsky]], [[CCC]], August 28, 2004</ref> .
[[#Disqualification]]
=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 [[WCCC 2007|2007]], [[WCCC 2008|2008]], [[WCCC 2009|2009]] and [[WCCC 2010|2010]] <ref>[[http://www.chessvibes.com/?q=reports/rybka-disqualified-and-banned-from-world-computer-chess-championships|Rybka disqualified and banned from World Computer Chess Championships | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], June 29, 2011</ref> .
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 <ref>[[http://www.computerschaak.nl/index.php?option=com_content&view=article&id=514%3Arybka-en-de-icga&catid=18%3Avereniging&Itemid=28&lang=en|Rybka and the ICGA]], [[http://www.csvn.nl/|CSVN Computerschaak]]</ref> , see [[ICGA Investigations]]
=See also=
* [[Claims that Strelka is Rybka]]
* [[Crafty]]
* [[Fruit]]
* [[ICGA Investigations]]
* [[Ippolit]]
* [[Rybka Controversy]]
* [[Strelka]]
=Publications=
* [[Jeroen Noomen]], [[Jos Uiterwijk]], [[Jaap van den Herik]] (**2007**). //The 15th World Computer Chess Championship//. [[ICGA Journal#30_2|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]], [[Depth#DiminishingReturns|Diminishing Returns]]
* [[Matej Guid]], [[Ivan Bratko]] (**2007**). //Factors affecting diminishing returns for searching deeper//. [[ICGA Journal#30_2|ICGA Journal, Vol. 30, No. 2]], [[http://www.ailab.si/matej/doc/Factors_Affecting_Diminishing_Returns.pdf|pdf]]
* [[Hans Secelle]]. [[Eric van Reem]] (**2007**). //Golden Summer for RYBKA//. [[ICGA Journal#30_3|ICGA Journal, Vol. 30, No. 3]]
* [[Mark Watkins]] (**2010**). //A comparison of Rybka and IPPOLIT//. [[http://www.open-chess.org/download/file.php?id=13|pdf]] <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=119|BB's Rybka/Ippolit comparison]] by [[Zach Wegner]], [[Computer Chess Forums|OpenChess Forum]], June 13, 2010</ref> » [[Ippolit]]
* [[Mark Watkins]] (**2011**). //A comparison of Rybka 1.0 Beta and Fruit 2.1//, [[http://www.open-chess.org/download/file.php?id=272|pdf, February 12, 2011 Version]] <ref>[[http://www.open-chess.org/viewtopic.php?f=5&t=1104|Feb 12 version: Rybka 1.0 Beta / Fruit 2.1 document]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], February 12, 2011</ref>
* [[Mark Watkins]] (**2011**). //A comparison of Rybka 1.0 Beta and Fruit 2.1//, [[http://www.open-chess.org/download/file.php?id=304|pdf, February 24, 2011 Version]]
* [[Mark Watkins]] (**2011**). //A comparison of Rybka 1.0 Beta and Fruit 2.1//, [[http://www.open-chess.org/download/file.php?id=332|pdf, March 11, 2011 Version]] » [[Fruit]]
* [[Anthony Cozzie]] (**2011**). //The Future of Computer Chess//. [[Selective Search]] 154, pp. 11, [[http://www.chesscomputeruk.com/SS_154.pdf|pdf]] hosted by [[Mike Watters]]
* [[Jaap van den Herik]], [[Krzysztof Siewicz]] (**2011**). //Open Source has a Price//. [[ICGA Journal#34_2|ICGA Journal, Vol. 34, No. 2]]
* [[David Levy]] (**2011**). //Rybka Disqualified and Banned from World Computer Chess Championships//.[[ICGA Journal#34_2|ICGA Journal, Vol. 34, No. 2]]
* [[David Levy]] (**2011**). //A Very Sad Case//. [[ICGA Journal#34_2|ICGA Journal, Vol. 34, No. 2]]
* [[Mark Lefler]], [[Robert Hyatt]], [[Harvey Williamson]], [[Who's Who|ICGA panel]] (**2011**). //Rybka Investigations and Survey of Findings for the ICGA//. [[ICGA Journal#34_2|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, [[http://www.chesscomputeruk.com/SS_155.pdf|pdf]] hosted by [[Mike Watters]]
* [[Mark Watkins]] (**2011**). //Review of the Rybka case//. [[http://www.open-chess.org/download/file.php?id=489|pdf]] from [[Computer Chess Forums|OpenChess Forum]] <ref>[[http://www.open-chess.org/viewtopic.php?f=5&t=1772|Rybka evidence recapitulation]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 03, 2012</ref>
* [[Søren Riis]] (**2012**). //A Gross Miscarriage of Justice in Computer Chess//. [[http://www.chessbase.com/news/2011/riis01.pdf|pdf]] hosted by [[ChessBase]]
* [[Arno Nickel]] (**2012**). //[[http://www.edition-marco-shop.de/epages/64079634.sf/de_DE/?ObjectPath=/Shops/64079634/Categories/Schachgeschehen/Computerschach|Die schöne neue Welt der Schachengines]]//. [[http://www.zeitschriftschach.de/|SCHACH]] 2,3,5,6 2012, [[http://www.edition-marco-shop.de/WebRoot/Store14/Shops/64079634/5177/F0A3/C389/D0DD/3A71/C0A8/2935/25F6/Die_schoene_neue_Welt_der_Schachengines.pdf|pdf]] (German) <ref>Part 1 covers [[Houdini]], [[Rybka]], [[Komodo]], [[Stockfish]], [[Critter]], [[Naum]], [[Chiron]] and [[Spike]]</ref>
* [[Ed Schroder|Ed Schröder]] (**2012**). //Rybka reloaded//. [[http://www.top-5000.nl/Rybka%20Reloaded.pdf|pdf]]
* [[Matej Guid]], [[Ivan Bratko]] (**2012**). //Detecting Fortresses in Chess//. [[http://ev.fe.uni-lj.si/|Elektrotehniški vestnik]], Vol. 79, Nos. 1-2, [[https://ailab.si/matej/doc/Detecting_Fortresses_in_Chess.pdf|pdf]] » [[Houdini]]
* [[Mark Watkins]] (**2013**). //Review of the Rybka case//. [[http://magma.maths.usyd.edu.au/~watkins/papers/RybkaRecap.pdf|pdf]]
* [[Søren Riis]] (**2014**). //[[http://www.sciencedirect.com/science/article/pii/S1875952114000159|What makes a chess program original? Revisiting the Rybka case]]//. [[http://www.journals.elsevier.com/entertainment-computing/|Entertainment Computing]], Vol. 5, No. 3
* [[Don Dailey]], [[Adam Hair]], [[Mark Watkins]] (**2014**). //[[http://www.sciencedirect.com/science/article/pii/S1875952113000177|Move Similarity Analysis in Chess Programs]]//. [[http://www.journals.elsevier.com/entertainment-computing/|Entertainment Computing]], Vol. 5, No. 3, [[http://magma.maths.usyd.edu.au/~watkins/papers/DHW.pdf|preprint as pdf]] <ref>[[http://www.top-5000.nl/clone.htm|A Pairwise Comparison of Chess Engine Move Selections]] by [[Adam Hair]], hosted by [[Ed Schroder|Ed Schröder]]</ref>
* [[David Levy]] (**2014**). //The RYBKA Case – Progress and Verdict//. [[ICGA Journal#37_4|ICGA Journal, Vol. 37, No. 4]] » [[Rybka Controversy]]
=Forum Posts=
==2004==
* [[http://www.stmintz.com/ccc/index.php?id=345143|Re: CCT6: Rybka /Bodo ???]] by [[Vasik Rajlich]], [[CCC]], January 27, 2004
==2005==
* [[http://www.stmintz.com/ccc/index.php?id=465686|Rybka 1.0 beta release - need testers]] by [[Vasik Rajlich]], [[CCC]], November 30, 2005
* [[http://www.stmintz.com/ccc/index.php?id=466792|Rybka 1.0 Announcement]] by [[Vasik Rajlich]], [[CCC]], December 05, 2005
* [[http://www.stmintz.com/ccc/index.php?id=467208|Is Rybbka a fruit clone?]] by Ziad Haddad, [[CCC]], December 06, 2005
* [[http://www.stmintz.com/ccc/index.php?id=469130|Rybka - How much Fruit is inside?]] by [[Daniel Mehrmann]], [[CCC]], December 11, 2005
* [[http://www.stmintz.com/ccc/index.php?id=469143|Rybka test position]] by K. Burcham, [[CCC]], December 11, 2005 » [[Ktulu]]
* [[http://www.stmintz.com/ccc/index.php?id=469209|Rybka uses PVS and not MTD(f). Its no Fruit-Clone]] by [[Chrilly Donninger]], [[CCC]], December 12, 2005
* [[http://www.stmintz.com/ccc/index.php?id=469728|The Code for the Rybka-Mate-Bug]] by [[Chrilly Donninger]], [[CCC]], December 13, 2005
* [[http://www.stmintz.com/ccc/index.php?id=470607|Unmasking the Secrets of Rybka and Fruit]] by [[Stuart Cracraft]], [[CCC]], December 15, 2005
* [[http://www.stmintz.com/ccc/index.php?id=470647|Secrets of Rybka and Fruit from my point of view]] by [[Sergei Markoff|Sergei S. Markoff]], [[CCC]], December 15, 2005
* [[http://www.stmintz.com/ccc/index.php?id=474330|Spike-Rybka]] by [[Vasik Rajlich]], [[CCC]], December 28, 2005 » [[IPCCC 2005 b]]
* [[http://www.stmintz.com/ccc/index.php?id=475888|The man behind Rybka and his thoughts as posted here on CCC]] by Mike Byrne, [[CCC]], December 31, 2005
==2006==
* [[http://www.stmintz.com/ccc/index.php?id=479366|Rybka and Fruit on Chessbase]] by [[Walter Faxon]], [[CCC]], January 14, 2006 » [[Fruit]], [[ChessBase]]
* [[http://www.stmintz.com/ccc/index.php?id=480599|The superior Rybka chess knowledge]] by [[Chrilly Donninger]], [[CCC]], January 18, 2006
* [[http://www.stmintz.com/ccc/index.php?id=487223|Rybka's NPS - one presumption]] by [[Vladan Vučković]], [[CCC]], February 16, 2006 » [[Nodes per second]]
* [[http://www.stmintz.com/ccc/index.php?id=489891|Rybka @ CCT8]] by [[Vasik Rajlich]], [[CCC]], February 26, 2006
==2007==
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=18|outlook and plans for Rybka 3]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 09, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=194|Rybka 2.3 release date now Monday February 12]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], February 04, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=246|Rybka 2.3 readme]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], February 13, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1041|Rybka @ Leiden ICT7]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], May 20, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1126|Open Letter and $100,000 Challenge to FIDE]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], May 31, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1170|How secure is the source code of Rybka?]] by SR, [[Computer Chess Forums|Rybka Forum]], June 05, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1360|Rybka 2.3.2a readme]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], June 18, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1373|Rybka @ Amsterdam 15th WCCC]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], June 19, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=1655|Strelka = Rybka 1.0]] by DarkAvenger, [[Computer Chess Forums|Rybka Forum]], July 07, 2007 » [[Strelka]]
* [[http://www.talkchess.com/forum/viewtopic.php?t=14959|What Strelka tells about Rybka's nodecount and depth]] by [[Ernest Bonnem]], [[CCC]], July 09, 2007
* [[http://www.talkchess.com/forum/viewtopic.php?t=14988|Longer comments by V. Rajlich]] by [[Marc Lacrosse]], [[CCC]], July 10, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=19118#pid19118|Re: Is Rybka a derivative of Fruit?]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], July 14, 2007
* [[http://www.talkchess.com/forum/viewtopic.php?t=15076|Fruit, Rybka, Strelka final conclusion! (I hope)]] by [[Michael Sherwin]], [[CCC]], July 13, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=2297|Rybka vs Zappa in Mexico City]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], September 28, 2007
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=2510|Rybka @ Leiden 27th Dutch CCC]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 29, 2007
==2008==
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006|Strelka 2.0]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008 » [[Strelka]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3006;pg=4|Re: Strelka 2.0 pg 4]] by [[Anthony Cozzie]], [[Computer Chess Forums|Rybka Forum]], January 11, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=19008|Rajlich/Osipov/Rybka/Strelka/Answers by Convekta]] by [[Eduard Nemeth]], [[CCC]], January 17, 2008 » [[Strelka]], [[ChessOK|Convekta]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3172|Anthony Cozzie speak !]] by Silvian, [[Computer Chess Forums|Rybka Forum]], February 03, 2008 <ref>[[http://www.stevelim.com/blog/?p=470|Anthony Cozzie speaks about Rybka source code]] from [[http://www.stevelim.com/|Steve Lim / SuperSteve3d - Home]], February 04, 2008</ref>
* [[http://www.talkchess.com/forum/viewtopic.php?t=20531|Rybka 3 with new GUI: are they serious?!]] by [[Jouni Uski]], [[CCC]], April 05, 2008 » [[Aquarium]]
* [[http://www.talkchess.com/forum/viewtopic.php?t=20740|Retry: Rybka 1.0 Beta Node Count Patch]] by Rick Fadden, [[CCC]], April 19, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=20936|Strelka Reverse Engineered from Rybka: Details Examined]] by Rick Fadden, [[CCC]], May 01, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=4247|Rybka @ Leiden 8th ICT]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], June 01, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=4807|Rybka 3 -- a hundred elo!]] by [[Larry Kaufman]], [[Computer Chess Forums|Rybka Forum]], July 08, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=5020|Rybka 3 - some info]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], July 19, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=22581|Rybka 3: The dark truth behind the hype]] by [[Albert Silver]], [[CCC]], July 25, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=5547|Rybka 3 Release Notes]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], August 04, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=5576|Rybka 3 FAQ]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], August 05, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=5606|Rybka v2.2n2 download]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], August 06, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23118|Rybka 1.0 vs. Strelka]] by [[Zach Wegner]], [[CCC]], August 19, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23249|Questions for Vas]] by [[Zach Wegner]], [[CCC]], August 25, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23252|A very simple question to Vas that can end it all]] by [[Christophe Théron]], [[CCC]], August 25, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23239|Rybka questions and answers]] by [[Chris Whittington]], [[CCC]], August 25, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=6772|question to vas on similarity of rybka 1.0 to fruit]] by duncan, [[Computer Chess Forums|Rybka Forum]], August 25, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23307|split 3 from Zach technical thread]] by [[Christophe Théron]], [[CCC]], August 27, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23313|My two cents]] by [[Anthony Cozzie]], [[CCC]], August 27, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23341|To campaign or not]] by [[Ed Schroder]], [[CCC]], August 28, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23386|How a court detects a derivative work]] by [[Christophe Théron]], [[CCC]], August 30, 2008
* [[http://talkchess.com/forum/viewtopic.php?topic_view=threads&p=214422&t=23424|Is It Me or is the Source Comparison Page Rigged?]] by RegicideX, [[CCC]], September 01, 2008 <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22337|Why did the ICGA ignore this advice?]] by [[John Sidles]], [[Computer Chess Forums|Rybka Forum]], July 06, 2011</ref> <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=23957;pg=5|Re: A Big Thanks and a Small Update]] by [[John Sidles]], [[Computer Chess Forums|Rybka Forum]], January, 08, 2012</ref>
* [[http://www.talkchess.com/forum/viewtopic.php?t=23474|Plagiarism and Rybka]] by [[Enrique Irazoqui]], [[CCC]], September 03, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=7738|Rybka @ 16th WCCC in Beijing]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 04, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=24504|Strelka = Rybka 1.0 =Fruit 2.1 = Toga?? Oh how disappointing]] by [[Oliver Brausch]], [[CCC]], October 21, 2008
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=8478|Rybka @ 28th Dutch CCC]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], November 18, 2008
==2009==
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=11022|Rybka @ Pamplona 17th ICGA World Computer Chess Championship]] by [[Vasik Rajlich]] from [[Computer Chess Forums|Rybka Forum]], May 17, 2009 » [[WCCC 2009]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=12960|Rybka @ 29th Open Dutch Computer Chess Championship]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 19, 2009 » [[DOCCC 2009]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=12995|Official statement on [Deleted]?]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 21, 2009
==2010==
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=16262|Rybka 4 update]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], April 11, 2010
* [[http://www.talkchess.com/forum/viewtopic.php?t=34497|Rybka 4 is final. (select games for fun)]] by [[Albert Silver]], [[CCC]], May 25, 2010
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=17010|Rybka 4 Release Notes]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], May 26, 2010
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=17206|ICT Leiden 2010: Rybka wins with 8/9. Opening report]] by [[Jeroen Noomen]], [[Computer Chess Forums|Rybka Forum]], May 30, 2010 » [[ICT 2010]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=17240|Rybka @ 10th ICT Leiden 2010]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], May 31, 2010 » [[ICT 2010]]
* [[http://www.open-chess.org/viewtopic.php?f=3&t=119|BB's Rybka/Ippolit comparison]] by [[Zach Wegner]], [[Computer Chess Forums|OpenChess Forum]], June 13, 2010
* [[http://www.talkchess.com/forum/viewtopic.php?t=36058|Deep Blue vs Rybka]] by [[Don Dailey]], [[CCC]], September 13, 2010
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=18935|Kanazawa Diary (Rybka operator in Japan)]] by [[Hans van der Zijden]], [[Computer Chess Forums|Rybka Forum]], September 24, 2010 » [[WCCC 2010]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=19026|WCCC 2010 in Kanzawa, Japan]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], October 2, 2010 » [[WCCC 2010]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=19574|Rybka @ 30th Dutch Computer Chess Championship]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], November 16, 2010 » [[DOCCC 2010]]
* [[http://www.open-chess.org/viewtopic.php?f=3&t=815|Brief Q&A about Rybka 1.0 Beta and Fruit 2.1]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], December 14, 2010
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=20058|Rybka Cluster Rental Program]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], December 30, 2010
==2011==
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1004|Node counting]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 20, 2011 » [[Node]]
* [[http://www.talkchess.com/forum/viewtopic.php?t=37762|Fabien's open letter to the community]] by [[Tord Romstad]], [[CCC]], January 23, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1014|Fabien's open letter to the community]] by [[Tord Romstad]], [[Computer Chess Forums|OpenChess Forum]], January 23, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1023|Revisiting Strelka/Rybka]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 25, 2011
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1104|Feb 12 version: Rybka 1.0 Beta / Fruit 2.1 document]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], February 12, 2011
* [[http://www.chessvibes.com/?q=reports/attack-of-the-clones|Attack of the clones | ChessVibes]] by [[David Levy]], 19 February, 2011
* [[http://www.chessvibes.com/?q=reports/programmers-write-open-letter-about-rybka-fruit-issue|Programmers write open letter about Rybka-Fruit issue | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], March 01, 2011
* [[http://www.hiarcs.net/forums/viewtopic.php?t=4038|Open letter to the ICGA about the Rybka-Fruit issue]] by [[Harvey Williamson]], [[Computer Chess Forums|Hiarcs Forum]], March 01, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1175|Programmers Open Letter to ICGA on Rybka/Fruit]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], March 01, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=21216|Rybka 1.6.1]] by [[Robert Hyatt]], [[Computer Chess Forums|Rybka Forum]], March 13, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=38440|Longer Article]] by [[Anthony Cozzie]], [[CCC]], March 17, 2011
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1281|History of eval changes in Rybka versions]] by[[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], March 23, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39520|Rybka disqualified and banned from World Computer Chess Cham]] by Tim Chan, [[CCC]], June 29, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22232|Rybka disqualified and banned from World Computer Chess Cham]] by TheHug, [[Computer Chess Forums|Rybka Forum]], June 29, 2011
* [[http://hiarcs.net/forums/viewtopic.php?t=4264&sid=ec7a3d377b4ca501b364599914913668|Rybka disqualified and banned from WCCC]] by [[Harvey Williamson]], [[Computer Chess Forums|Hiarcs Forum]], June 29, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1463|Rybka disqualified and banned from WCCC]] by [[Jeremy Bernstein]], [[Computer Chess Forums|OpenChess Forum]], June 29, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39531|Rybka ban thoughts]] by [[Dann Corbit]], [[CCC]], June 29, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39544|My two cents on Rybka's disqualification]] by [[Joona Kiiski]], [[CCC]], June 30, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39546|Dismissed with prejudice]] by [[Dann Corbit]], [[CCC]], July 01, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39545|Voir Dire]] by [[Dann Corbit]], [[CCC]], July 01, 2011 <ref>[[http://en.wikipedia.org/wiki/Voir_dire|Voir dire from Wikipedia]]</ref>
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22265|Vas say something]] by siam, [[Computer Chess Forums|Rybka Forum]], July 01, 2011
* [[http://open-chess.org/viewtopic.php?f=3&t=1466|The ICGA Process]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], July 01, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1471|Progess (often) is ugly, a summary try]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|OpenChess Forum]], July 03, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=39593|Is Rybka that needs ICGA or the opposite ?]] by [[Marco Costalba]], [[CCC]], July 03, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?start=0&t=39592|The Intellectual Property Oxymoron]] by Gary Belton, [[CCC]], July 03, 2011
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1475|The Evidence against Rybka]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], July 04, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22337|Why did the ICGA ignore this advice?]] by [[John Sidles]], [[Computer Chess Forums|Rybka Forum]], July 06, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22370|Minority Report Plagiarism - Quantifying Evaluation Features]] by [[Chris Whittington|Trotsky]], [[Computer Chess Forums|Rybka Forum]], July 09, 2011
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1497|Back to R3/IPPOLIT(/R4?)]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], July 14, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22421|In retrospect]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|Rybka Forum]], July 14, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22486|Minority Report 2 - Unravelling the technical report]] by [[Chris Whittington|Trotsky]], [[Computer Chess Forums|Rybka Forum]], July 22, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22502|Minority Report 3, PST + other lookup tables are they legal?]] by [[Chris Whittington|Trotsky]], [[Computer Chess Forums|Rybka Forum]], July 25, 2011
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1519|On Rybka/Crafty and licensing/copyright]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], July 28, 2011
* [[http://www.open-chess.org/viewtopic.php?f=3&t=1559|Thoughts on Fruit=Rybka EVAL]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|OpenChess Forum]], August 16, 2011
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=22679|Apology to Vas]] by [[Ed Schroder|Rebel]], [[Computer Chess Forums|Rybka Forum]], August 17, 2011
==2012==
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1772|Rybka evidence recapitulation]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 03, 2012
* [[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=23957|A Big Thanks and a Small Update]] by [[Vasik Rajlich]], [[Computer Chess Forums|Rybka Forum]], January 08, 2012
* [[http://www.open-chess.org/viewtopic.php?f=5&t=1795|Fruit/Rybka timeline]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 09, 2012
* [[http://www.talkchess.com/forum/viewtopic.php?t=42248|Rybka 1.0 source code]] by [[Ed Schroder|Ed Schröder]], [[CCC]], January 31, 2012 <ref>[[http://www.top-5000.nl/sourcecode.htm|Fruit 2.1 and Rybka 1.0 Beta 1.0 decompiled source code]] by [[Ed Schroder|Ed Schröder]]</ref>
=External Links=
==Rybka==
* [[http://en.wikipedia.org/wiki/Rybka|Rybka from Wikipedia]]
* [[http://en.wikipedia.org/wiki/Rybka_%28disambiguation%29|Rybka (disambiguation) from Wikipedia]]
* [[http://www.game-ai-forum.org/icga-tournaments/program.php?id=79|Rybka's ICGA Tournaments]]
* [[http://www.rybkachess.com/index.php|Welcome to RybkaChess.com!]]
* [[http://rybkaforum.net/cgi-bin/rybkaforum/forum_show.pl|Rybka Chess Community Forum]]
* [[http://cluster.rybkachess.com/|Rybka Cluster - for the elite chess player]]
* [[http://www.top-5000.nl/int/rybka.htm|Interview with Vasik Rajlich]] by [[Christopher Conkie]], [[Michael Diosi]], [[Frank Quisinsky]] & [[Alexander Schmidt]], December 20, 2005, hosted by [[Ed Schroder|Ed Schröder]]
* [[http://chessok.com/files/bobpawlak/News/RybkaReview.html|ChessAssistance.com Rybka Review]] by [[Robert Pawlak]], September 23, 2006
* [[http://latestchess.com/showInterview.php?id=4|Interview with IM Vasik Rajlich, author of Rybka chess program]] Written by content team 24 July 2007 from [[http://latestchess.com/index.php|LatestChess.com]]
* [[http://www.johnljerz.com/superduper/tlxdownloadsiteMAIN/id7.html|Rybka Explained?]] by [[John L. Jerz]]
* [[http://www.johnljerz.com/superduper/tlxdownloadsiteMAIN/id18.html|Does Rybka Properly Count Positions Evaluated?]] by [[John L. Jerz]]
* [[http://www.johnljerz.com/superduper/tlxdownloadsiteMAIN/id22.html|The chess program Rybka as a Rational Agent]] by [[John L. Jerz]]
* [[http://www.chessbase.com/newsdetail.asp?newsid=4772|Rybka 3.0 – Not just the strongest chess program in the world]], July 18, 2008, [[ChessBase|ChessBase News]]
* [[http://www.stevelim.com/blog/?p=470|Anthony Cozzie speaks about Rybka source code]] from [[http://www.stevelim.com/|Steve Lim / SuperSteve3d - Home]], February 04, 2008 » [[Anthony Cozzie]], [[Strelka]] <ref>[[http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=3172|Anthony Cozzie speak !]] by Silvian, [[Computer Chess Forums|Rybka Forum]], February 03, 2008</ref>
* [[http://www.chessbase.com/newsdetail.asp?newsid=5075|Rybka's Monte Carlo analysis]] by [[Steve Lopez]], [[ChessBase|ChessBase News]], February 03, 2009
* [[http://www.neues-deutschland.de/artikel/173921.rybka-doch-nicht-unbesiegbar.html|Rybka doch nicht unbesiegbar]], [[http://en.wikipedia.org/wiki/Neues_Deutschland|Neues Deutschland]], June 26, 2010 (German)
==Controversy==
* [[http://www.chessvibes.com/?q=reports/attack-of-the-clones|Attack of the clones | ChessVibes]] by [[David Levy]], 19 February, 2011
* [[http://www.spiegel.de/netzwelt/gadgets/0,1518,748616,00.html|Schach-Software Rybka - Programmierer vermuten Intelligenzklau]] by [[http://www.spiegel.de/extra/0,1518,632080,00.html|Frank Patalong]], [[http://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online|Spiegel Online]], March 03, 2011 (German)
* [[http://www.heise.de/newsticker/meldung/Plagiatsvorwurf-gegen-Computerschach-Weltmeister-1200222.html|Plagiatsvorwurf gegen Computerschach-Weltmeister]], [[http://de.wikipedia.org/wiki/Heise_online|Heise online]], March 01, 2011 (German)
* [[http://www.chessvibes.com/?q=reports/rybka-disqualified-and-banned-from-world-computer-chess-championships|Rybka disqualified and banned from World Computer Chess Championships | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], June 29, 2011
* [[http://susanpolgar.blogspot.com/2011/06/breaking-news-rybka-banned.html|Susan Polgar Chess Daily News and Information: Breaking News! Rybka banned!]], June 29, 2011
* [[http://www.magnuscarlsen.co.uk/rybka-disqualified-and-banned-from-world-computer-chess-championships/|Rybka disqualified and banned from World Computer Chess Championships - Chess Weekly]]
* [[http://chess.business-news-blog.eu/2011/rybka-banned-by-international-games-federation-rybka-ruling/|Rybka banned by International Games Federation – Rybka Ruling]]
* [[http://www.extremetech.com/extreme/88610-rybka-the-worlds-best-chess-engine-outlawed-and-disqualified|Rybka, the world’s best chess engine, outlawed and disqualified | ExtremeTech]] by [[http://www.mrseb.co.uk/|Sebastian Anthony]] on June 29, 2011
* [[http://m.washingtontimes.com/news/2011/jun/30/computer-chess-champ-stripped-of-its-four-titles/|Computer chess champ stripped of its four titles]] by [[http://www.linkedin.com/pub/claire-courchane/2a/857/3b|Claire Courchane]], [[http://en.wikipedia.org/wiki/The_Washington_Times|Washington Times]], June 30, 2011
* [[http://www.itproportal.com/2011/06/30/rybka-disqualified-banned-on-plagiarism-charges/|Rybka Disqualified, Banned On Plagiarism Charges | ITProPortal.com]] by [[http://www.itproportal.com/staff/ravimandalia/|Ravi Mandalia]], June 30, 2011
* [[http://boylston-chess-club.blogspot.com/2011/06/rybka-banned-from-computer-champs.html|Boylston Chess Club Weblog: Rybka banned from computer champs; stripped of all its titles]], June 30, 2011
* [[http://www.metro.co.uk/news/867998-computer-chess-reels-from-biggest-sporting-scandal-since-ben-johnson|Computer chess reels from 'biggest sporting scandal since Ben Johnson' | Metro.co.uk]] by [[http://tariqtahir.com/|Tariq Tahir]], June 30th, 2011
* [[http://www.heise.de/newsticker/meldung/Schachcomputer-Weltmeister-nachtraeglich-disqualifiziert-1271033.html|Schachcomputer-Weltmeister nachträglich disqualifiziert]], [[http://de.wikipedia.org/wiki/Heise_online|Heise online]], June 30, 2011 (German)
* [[http://www.spiegel.de/netzwelt/games/0,1518,771620,00.html|Weltmeisterprogramm Rybka verliert alle Titel]] by [[http://www.spiegel.de/extra/0,1518,632080,00.html|Frank Patalong]], [[http://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online|Spiegel Online]], July 01, 2011 (German)
* [[http://www.nytimes.com/2011/07/03/crosswords/chess/developer-of-computer-chess-champ-accused-of-stealing-code.html?_r=1|Developer of Computer Chess Champ Accused of Stealing Code]] by [[http://topics.nytimes.com/top/reference/timestopics/people/m/dylan_loeb_mcclain/index.html?inline=nyt-per|Dylan Loeb McClain]], [[http://en.wikipedia.org/wiki/The_New_York_Times|NYTimes.com]], July 2, 2011
* [[http://diepresse.com/home/spectrum/spielundmehr/676421/Geklontes-Fischchen|Geklontes Fischchen]] by [[Stefan Löffler]], July 08, 2011, [[http://diepresse.com/home/index.do|DiePresse.com]] (German)
* [[http://www.computerschaak.nl/index.php?option=com_content&view=article&id=514%3Arybka-en-de-icga&catid=18%3Avereniging&Itemid=28&lang=en|Rybka and the ICGA]], [[http://www.csvn.nl/|CSVN Computerschaak]]
* [[http://www.top-5000.nl/Rybka.htm|Rybka vs ICGA a different view]] by [[Ed Schroder|Ed Schröder]], November 09, 2011
* [[http://www.top-5000.nl/evidence.htm|Rybka evidence]] by [[Ed Schroder|Ed Schröder]], November 09, 2011
* [[http://www.chessbase.com/newsdetail.asp?newsid=7791|A Gross Miscarriage of Justice in Computer Chess (part one)]] by [[Søren Riis]], [[ChessBase|ChessBase News]], January 02, 2012 <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1771|ChessBase: A Gross Miscarriage of Justice in Computer Chess]] by [[Franklin Titus|kingliveson]], [[Computer Chess Forums|OpenChess Forum]], January 02, 2012</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1771#p15455|Re: ChessBase: A Gross Miscarriage of Justice in Computer Chess]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 02, 2012</ref> <ref>[[http://www.open-chess.org/viewtopic.php?f=3&t=1763&p=15497#p15459|Re: Hyatt Is Gone!]] by [[Mark Watkins|BB+]] [[Computer Chess Forums|OpenChess Forum]], Jan 03, 2012</ref>
> [[http://www.chessbase.com/newsdetail.asp?newsid=7807|A Gross Miscarriage of Justice in Computer Chess (part two)]] by [[Søren Riis]], [[ChessBase|ChessBase News]], January 03, 2012 <ref>[[http://www.open-chess.org/viewtopic.php?f=5&t=1772|Rybka evidence recapitulation]] by [[Mark Watkins|BB+]], [[Computer Chess Forums|OpenChess Forum]], January 03, 2012</ref>
> [[http://www.chessbase.com/newsdetail.asp?newsid=7811|A Gross Miscarriage of Justice in Computer Chess (part three)]] by [[Søren Riis]], [[ChessBase|ChessBase News]], January 04, 2012
> [[http://www.chessbase.com/newsdetail.asp?newsid=7813|A Gross Miscarriage of Justice in Computer Chess (part four)]] by [[Søren Riis]], [[ChessBase|ChessBase News]], January 05, 2012 <ref>[[Søren Riis]] (**2012**). //A Gross Miscarriage of Justice in Computer Chess//. [[http://www.chessbase.com/news/2011/riis01.pdf|pdf]] hosted by [[ChessBase]]</ref>
* [[http://www.chessvibes.com/?q=reports/controversy-over-rybkas-disqualification-and-ban-update|Controversy over Rybka's disqualification and ban (UPDATE) | ChessVibes]] by [[http://www.chessvibes.com/?q=peterdoggers|Peter Doggers]], January 08, 2012
* [[http://www.chessbase.com/newsdetail.asp?newsid=7899|ICGA/Rybka controversy: An interview with David Levy (1)]], [[ChessBase|ChessBase News]], February 06, 2012
> [[http://www.chessbase.com/newsdetail.asp?newsid=7908|ICGA/Rybka controversy: An interview with David Levy (2)]], [[ChessBase|ChessBase News]], February 10, 2012
* [[http://www.chessbase.com/newsdetail.asp?newsid=7926|ICGA/Rybka controversy: Feedback]], [[ChessBase|ChessBase News]], February 17, 2012
=References=
<references />
=What links here?=
[[include page="Rybka" component="backlinks" limit="180"]]
**[[Engines|Up one Level]]**