Changes

Allegations have surfaced that [[Rybka|Rybka 1.0 beta]] <ref>[http://www.chess.com/download/view/rybka-beta-10 Rybka 1.0 beta]</ref> and other versions of Rybka are derivatives of [[Fruit|Fruit 2.1]] and [[Crafty]]. If versions of Rybka are derived from Fruit and participated in ICGA tournaments, then Rybka has violated [[ICGA Tournament Rules]]. Fruit 2.1 <ref>[http://arctrix.com/nas/chess/fruit/ Fruit 2.1]</ref> source code was distributed with a [https://icga.wikispaces.com/fruit+copying.txt specific license]. Part of this license reads "For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights." Allegations state that by distributing Rybka which is based on Fruit, this GNU license was violated. The ICGA rules state "Programming teams whose code is derived from or including game-playing code written by others must name all other authors, or the source of such code, in the details of their submission form.". No such notification was included in the Rybka entry forms.

On February 19, 2011 [[ICGA]] president [[David Levy]] broached on [[:Category:Clone|cloning]] issues in a ''ChessVibes'' column <ref>[http://www.chessvibes.com/?q=reports/attack-of-the-clones Attack of the clones : ChessVibes] by [[David Levy]], February 19 February, 2011</ref>.

The letter was published in the private [[ICGA Investigations|ICGA Investigations Wiki]] <ref>[http://icga.wikispaces.com/ ICGA Investigations Wiki]</ref> and elsewhere <ref>[https://web.archive.org/web/20180820105430/http://www.chessvibes.com/?q=reports/programmers-write-open-letter-about-rybka-fruit-issue Programmers write open letter about Rybka-Fruit issue : | ChessVibes] by [http://www.chessvibes.com/?q=peterdoggers [Peter Doggers]], March 01, 2011([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</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>.

There is ample [[prePre-fruit Fruit Rybka and Crafty|evidence]] that the latter two versions contained large amounts of Crafty code, in direct contravention of both the relevant Crafty license and the rules of these tournaments. Based on the last tournament pre-Rybka played in, its rating was about 2064 ELO <ref>[http://www.open-aurec.com/chesswar/Chesswar007/Chesswar007CSt.htm ChessWar VII C 40m/20' - Final standings after round 11]</ref>.

The final decision on the [[Rybka]] case by the [[Who's Who#ICGABoard|ICGA Board]], June 28, 2011: ''Rybka [[World Computer Chess Championship#RybkaDisqualification|disqualified]] and banned from [[World Computer Chess Championship|World Computer Chess Championships]]'' <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> <ref>[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</ref> <ref>[http://ilk.uvt.nl/icga/ ICGA Home Page]</ref>.

At January 08, 2012 the [[ICGA]] responds with two rebuttal articles on [[Søren Riis|Riis']] ''[[Søren Riis#Miscarriage|A Gross Miscarriage of Justice in Computer Chess]]'', with an introduction letter from [[David Levy]], President of the ICGA <ref>[httphttps://wwwweb.talkchessarchive.comorg/forumweb/viewtopic.php?t=41866 ICGA response to ChessBase 4-part article] by [[Robert Hyatt]], [[CCC]], January 08, 2012<20180820104913/ref> <ref>[http://www.chessvibes.com/?q=reports/controversy-over-rybkas-disqualification-and-ban-update Controversy over Rybka's disqualification and ban (UPDATE) | ChessVibes] by [http://www.chessvibes.com/?q=peterdoggers [Peter Doggers]], January 08, 2012([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref> <ref>[http://www.chessbase.com/newsdetail.asp?newsid=7836 Feedback on the ICGA/Rybka disqualification scandal], [[ChessBase|ChessBase News]], January 13, 2012</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]], 19 February, 2011([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])* [https://web.archive.org/web/20180820105430/http://www.chessvibes.com/?q=reports/programmers-write-open-letter-about-rybka-fruit-issue Programmers write open letter about Rybka-Fruit issue : | ChessVibes] by [http://www.chessvibes.com/?q=peterdoggers [Peter Doggers]], March 01, 2011([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine]

* [http://www.talkchess.com/forum/viewtopic.php?t=41968 CB: Feedback on the ICGA/Rybka disqualification scandal] by [http://www.talkchess.com/forum/profile.php?mode=viewprofile&u=608 [Ted Summers]], [[CCC]], January 13, 2012 <ref>[http://www.chessbase.com/newsdetail.asp?newsid=7836 Feedback on the ICGA/Rybka disqualification scandal], [[ChessBase|ChessBase News]], January 13, 2012</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([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])

* [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])

* [https://web.archive.org/web/20180820104913/http://www.chessvibes.com/?q=reports/controversy-over-rybkas-disqualification-and-ban-update Controversy over Rybka's disqualification and ban (UPDATE) | ChessVibes] by [http://www.chessvibes.com/?q=peterdoggers [Peter Doggers]], January 08, 2012([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])

* [https://en.chessbase.com/post/feedback-on-the-icga-rybka-disqualification-scandal Feedback on the ICGA/Rybka disqualification scandal], [[ChessBase|ChessBase News]], January 13, 2012 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=41968 CB: Feedback on the ICGA/Rybka disqualification scandal] by [http://www.talkchess.com/forum/profile.php?mode=viewprofile&u=608 [Ted Summers]], [[CCC]], January 13, 2012</ref>