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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
