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'''[[Main Page|Home]] * [[Engines]] * Rybka'''
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'''Rybka''',<br/>
a chess engine by primary author [[Vasik Rajlich]], from 2007 until 2010 dominating and reigning [[World Computer Chess Championship|World Computer Chess Champion]] and holder of the [[Shannon Trophy]], winning the [[WCCC 2007]] <ref>[https://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. 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.
=Team=
The Rybka team consists of primary author and [https://en.wikipedia.org/wiki/International_Master#International_Master_.28IM.29 International Master] [[Vasik Rajlich]], supported by [https://en.wikipedia.org/wiki/Grandmaster_%28chess%29 Grandmaster] and [[Evaluation|evaluation]] expert [[Larry Kaufman]] (Rybka 3), Rybka's main tester and [https://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>[https://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> and the first commercial version, ''Rybka 1'' <ref>[https://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://www.talkchess.com/forum/viewtopic.php?t=13289 SSDF Rating List 2007-04-21] by [[Thoralf Karlsson]], [[CCC]], April 21, 2007</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=
{| class="wikitable"
|-
! 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> .
<pre>
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;
}
}
</pre>
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>[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 [https://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>[https://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>[https://www.stmintz.com/ccc/index.php?id=467208 Is Rybbka a fruit clone?] by Ziad Haddad, [[CCC]], December 06, 2005</ref> and questions <ref>[https://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>''Attack of the clones'' | ChessVibes by [[David Levy]], 19 February, 2011 (as of August 31, 2018 - Internal Server Error)</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.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 [https://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], [https://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>[https://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>[https://www.stmintz.com/ccc/index.php?id=384790 Open letter by Eugenio Castillo (ELChinito team) ...] by [[Frank Quisinsky]], [[CCC]], August 28, 2004</ref> .
<span id="Disqualification"></span>
=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==
* [https://www.stmintz.com/ccc/index.php?id=345143 Re: CCT6: Rybka /Bodo ???] by [[Vasik Rajlich]], [[CCC]], January 27, 2004
==2005==
* [https://www.stmintz.com/ccc/index.php?id=465686 Rybka 1.0 beta release - need testers] by [[Vasik Rajlich]], [[CCC]], November 30, 2005
* [https://www.stmintz.com/ccc/index.php?id=466792 Rybka 1.0 Announcement] by [[Vasik Rajlich]], [[CCC]], December 05, 2005
* [https://www.stmintz.com/ccc/index.php?id=467208 Is Rybbka a fruit clone?] by Ziad Haddad, [[CCC]], December 06, 2005
* [https://www.stmintz.com/ccc/index.php?id=469130 Rybka - How much Fruit is inside?] by [[Daniel Mehrmann]], [[CCC]], December 11, 2005
* [https://www.stmintz.com/ccc/index.php?id=469143 Rybka test position] by K. Burcham, [[CCC]], December 11, 2005 » [[Ktulu]]
* [https://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
* [https://www.stmintz.com/ccc/index.php?id=469728 The Code for the Rybka-Mate-Bug] by [[Chrilly Donninger]], [[CCC]], December 13, 2005
* [https://www.stmintz.com/ccc/index.php?id=470607 Unmasking the Secrets of Rybka and Fruit] by [[Stuart Cracraft]], [[CCC]], December 15, 2005
* [https://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
* [https://www.stmintz.com/ccc/index.php?id=474330 Spike-Rybka] by [[Vasik Rajlich]], [[CCC]], December 28, 2005 » [[IPCCC 2005 b]]
* [https://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==
* [https://www.stmintz.com/ccc/index.php?id=479366 Rybka and Fruit on Chessbase] by [[Walter Faxon]], [[CCC]], January 14, 2006 » [[Fruit]], [[ChessBase]]
* [https://www.stmintz.com/ccc/index.php?id=480599 The superior Rybka chess knowledge] by [[Chrilly Donninger]], [[CCC]], January 18, 2006
* [https://www.stmintz.com/ccc/index.php?id=487223 Rybka's NPS - one presumption] by [[Vladan Vučković]], [[CCC]], February 16, 2006 » [[Nodes per second]]
* [https://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.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>[https://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://www.rybkachess.com/index.php Welcome to RybkaChess.com!]
* [http://cluster.rybkachess.com/ Rybka Cluster - for the elite chess player]
* [https://en.wikipedia.org/wiki/Rybka Rybka from Wikipedia]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=79 Rybka's ICGA Tournaments]
* [http://rybkaforum.net/cgi-bin/rybkaforum/forum_show.pl Rybka Chess Community Forum]
* [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://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.chessbase.com/newsdetail.asp?newsid=5075 Rybka's Monte Carlo analysis] by [[Steve Lopez]], [[ChessBase|ChessBase News]], February 03, 2009
==Controversy==
* [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], [https://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.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], [https://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online Spiegel Online], July 01, 2011 (German)
* [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.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.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
==Misc==
* [https://en.wikipedia.org/wiki/Rybka_%28disambiguation%29 Rybka (disambiguation) from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[FILE:Rybka4Logo.png|thumb|link=http://rybkachess.com.www52.your-server.de/index.php?auswahl=Purchase+Rybka| 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> ]]
'''Rybka''',<br/>
a chess engine by primary author [[Vasik Rajlich]], from 2007 until 2010 dominating and reigning [[World Computer Chess Championship|World Computer Chess Champion]] and holder of the [[Shannon Trophy]], winning the [[WCCC 2007]] <ref>[https://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. 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.
=Team=
The Rybka team consists of primary author and [https://en.wikipedia.org/wiki/International_Master#International_Master_.28IM.29 International Master] [[Vasik Rajlich]], supported by [https://en.wikipedia.org/wiki/Grandmaster_%28chess%29 Grandmaster] and [[Evaluation|evaluation]] expert [[Larry Kaufman]] (Rybka 3), Rybka's main tester and [https://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>[https://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> and the first commercial version, ''Rybka 1'' <ref>[https://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://www.talkchess.com/forum/viewtopic.php?t=13289 SSDF Rating List 2007-04-21] by [[Thoralf Karlsson]], [[CCC]], April 21, 2007</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=
{| class="wikitable"
|-
! 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> .
<pre>
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;
}
}
</pre>
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>[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 [https://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>[https://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>[https://www.stmintz.com/ccc/index.php?id=467208 Is Rybbka a fruit clone?] by Ziad Haddad, [[CCC]], December 06, 2005</ref> and questions <ref>[https://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>''Attack of the clones'' | ChessVibes by [[David Levy]], 19 February, 2011 (as of August 31, 2018 - Internal Server Error)</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.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 [https://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], [https://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>[https://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>[https://www.stmintz.com/ccc/index.php?id=384790 Open letter by Eugenio Castillo (ELChinito team) ...] by [[Frank Quisinsky]], [[CCC]], August 28, 2004</ref> .
<span id="Disqualification"></span>
=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==
* [https://www.stmintz.com/ccc/index.php?id=345143 Re: CCT6: Rybka /Bodo ???] by [[Vasik Rajlich]], [[CCC]], January 27, 2004
==2005==
* [https://www.stmintz.com/ccc/index.php?id=465686 Rybka 1.0 beta release - need testers] by [[Vasik Rajlich]], [[CCC]], November 30, 2005
* [https://www.stmintz.com/ccc/index.php?id=466792 Rybka 1.0 Announcement] by [[Vasik Rajlich]], [[CCC]], December 05, 2005
* [https://www.stmintz.com/ccc/index.php?id=467208 Is Rybbka a fruit clone?] by Ziad Haddad, [[CCC]], December 06, 2005
* [https://www.stmintz.com/ccc/index.php?id=469130 Rybka - How much Fruit is inside?] by [[Daniel Mehrmann]], [[CCC]], December 11, 2005
* [https://www.stmintz.com/ccc/index.php?id=469143 Rybka test position] by K. Burcham, [[CCC]], December 11, 2005 » [[Ktulu]]
* [https://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
* [https://www.stmintz.com/ccc/index.php?id=469728 The Code for the Rybka-Mate-Bug] by [[Chrilly Donninger]], [[CCC]], December 13, 2005
* [https://www.stmintz.com/ccc/index.php?id=470607 Unmasking the Secrets of Rybka and Fruit] by [[Stuart Cracraft]], [[CCC]], December 15, 2005
* [https://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
* [https://www.stmintz.com/ccc/index.php?id=474330 Spike-Rybka] by [[Vasik Rajlich]], [[CCC]], December 28, 2005 » [[IPCCC 2005 b]]
* [https://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==
* [https://www.stmintz.com/ccc/index.php?id=479366 Rybka and Fruit on Chessbase] by [[Walter Faxon]], [[CCC]], January 14, 2006 » [[Fruit]], [[ChessBase]]
* [https://www.stmintz.com/ccc/index.php?id=480599 The superior Rybka chess knowledge] by [[Chrilly Donninger]], [[CCC]], January 18, 2006
* [https://www.stmintz.com/ccc/index.php?id=487223 Rybka's NPS - one presumption] by [[Vladan Vučković]], [[CCC]], February 16, 2006 » [[Nodes per second]]
* [https://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.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>[https://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://www.rybkachess.com/index.php Welcome to RybkaChess.com!]
* [http://cluster.rybkachess.com/ Rybka Cluster - for the elite chess player]
* [https://en.wikipedia.org/wiki/Rybka Rybka from Wikipedia]
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=79 Rybka's ICGA Tournaments]
* [http://rybkaforum.net/cgi-bin/rybkaforum/forum_show.pl Rybka Chess Community Forum]
* [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://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.chessbase.com/newsdetail.asp?newsid=5075 Rybka's Monte Carlo analysis] by [[Steve Lopez]], [[ChessBase|ChessBase News]], February 03, 2009
==Controversy==
* [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], [https://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.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], [https://en.wikipedia.org/wiki/Der_Spiegel#Spiegel_Online Spiegel Online], July 01, 2011 (German)
* [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.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.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
==Misc==
* [https://en.wikipedia.org/wiki/Rybka_%28disambiguation%29 Rybka (disambiguation) from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
