Rybka

Rybka is a computer chess engine designed by International Master Vasik Rajlich. As of February 2011, Rybka is one of the top-rated engines on chess engine rating lists and has won many computer chess tournaments.

Although Rybka won four consecutive World Computer Chess Championships from 2007 to 2010, it was stripped of these titles after an International Computer Games Association panel concluded in June 2011 that Rybka plagiarized code from both the Crafty and the Fruit chess engines. The finding is disputed.