More importantly, many of these engines are open source and so don't cost a dime.Shortly after Arne wrote his piece, in May 2010, version no. Several new engines have appeared on the scene, and we hear names such as Firebird and Stockfish. But, as Arne noted in his March 2010 piece, things are much more complicated these days. Eventually, in July 2008, Chessbase had to admit that Fritz wasn't the strongest anymore, and started selling Rybka.With one engine clearly standing out, the chess fan's life was easy. Then, around 2005, Vasik Rajlich's Rybka started to rule the chess engine scene like Kasparov had done in regular chess. Then, when top GMs analyzed their games for a chess magazine, sometimes they would mention other engines, like Shredder, Hiarcs or Junior. Organizer Martin Thoresen: "I think open source is the way of the future."For years and years it was Fritz. The match lasted forty games and the final score was 23.5-16.5. In what could be loosely described as the unofficial world championship of chess engines, free chess engine Houdini beat commercial engine Rybka.
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