at ChessVibes and invoked a programmers forum to decide the merits. The options include revoking all tournament victories of Rybka by Statute 3.h.iv. Fourteen well-known chess programmers have since written an open letter to David Levy, Jaap van den Herik and the ICGA board stating that there is now "overwhelming evidence" that Rybka 1.0 beta (the first strong Rybka version) was directly derived from Fruit. WCCC disqualification and banning On June 28, 2011, the International Computer Games Association (ICGA) concluded their investigation and determined that Vasik Rajlich in programming Rybka had plagiarized two other chess software programs: Crafty and Fruit. According to ICGA, Vasik Rajlich failed to comply with the ICGA rule that each computer chess program must be the original work of the entering developer and those "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 their submission details". The ICGA regarded Vasik Rajlich's alleged violation as the most serious offence that a chess programmer and ICGA member can commit with respect to his peers and to the ICGA. The ICGA sanction for Vasik Rajlich and Rybka was the disqualification from the World Computer Chess Championship (WCCC) of 2006, 2007, 2008, 2009 and 2010. Vasik Rajlich was also banned for life from competing in the WCCC or any other event organized or sanctioned by the ICGA. In addition, the ICGA demanded that Vasik Rajlich return to the ICGA the four replicas of the Shannon Trophy presented at the WCCC in 2007, 2008, 2009 and 2010 and all prize money awarded for Rybka's performances in those events. Response On publication of the ICGA verdict and sentence, extensive disagreement broke out on Computer Chess Forums, centering on correct application of Abstraction-Filtration-Comparison test, the differences between copying ideas and copying code and bias in investigation. Rajlich responded to the ICGA's allegations in a video interview with Nelson Hernandez, and answered questions about the controversy and his opinions on it. In January 2012, ChessBase.com published an article by Dr. Søren Riis. Riis, a computer scientist at the Queen Mary University of London and a Rybka forum moderator, was critical of the ICGA's decision, the investigation, the methods on which the investigation was based, and the bias of the panel members and Secretariat. Riis argued that critical portions of the ICGA panel report that appeared to show line-by-line code