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=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=
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 [[:Category:Clone|cloning]] issues in a ''ChessVibes'' column <ref>[https://web.archive.org/web/20180828211326/http://www.chessvibes.com/?q=reports/attack-of-the-clones Attack of the clones | ChessVibes] by [[David Levy]], February 19, 2011([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</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]]
* [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
* [https://web.archive.org/web/20180828211326/http://www.chessvibes.com/?q=reports/attack-of-the-clones Attack of the clones | ChessVibes] by [[David Levy]], February 19, 2011([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [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
