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Rybka

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=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 [[:Category:Opening Book AuthorsAuthor|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=
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Due to the disputed [[:Category: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=
=Controversies=
==Rybka 1.0 and Fruit==
Rajlich's interpretation of [[Nodes per secondSecond|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> :
==Ippolit==
The appearance of the [[Ippolit]] [[:Category:Open Source Engines|open source program]] by pseudonymous authors in May 2009, and Rajlich's claim it is a [[Clones:Category:Clone|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: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 February, 2011 (as of August 31, 2018 - Internal Server Error[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]]
<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>[https://web.archive.org/web/20160419082204/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([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</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]]
* [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?tid=1690 (Experimental) 64-bit Rybka on Linux] by [[Steinar H. Gunderson|Sesse]], [[Computer Chess Forums|Rybka Forum]], July 10, 2007 » [[Linux]]
* [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=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/forum3/viewtopic.php?f=2&t=23157 Rybka in the nolot suite] by [[Uri Blass]], [[CCC]], August 21, 2008 » [[The Nolot Suite]]
* [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.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
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