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THE CHESS WORLD
Free chess engines
Here is a list of free chess engines for Winboard and Arena interfaces. The strongest engines are listed at the top, the weakest ones lower.
You can download Rybka 1.0 Beta for free. The Rybka 1.0 Beta version does give a fairly good introduction to the style and general approach of the engine but it doesn´t support multivariation mode and and ignores underpromotions to knights for example .
Rating ELO: 2920
Rybka 1.0 Beta (free)
Alaric v.707
Rating ELO: 2752
Rating ELO: 2863
Fruit v.2.3.1
At the World Computer Chess Championship in Reykjavík in 2005, Fruit scored 8.5 out of 11, finishing in second place behind Zappa.
Strelka 1.0 Beta
Rating ELO: 2850
Toga II 1.4 Beta 5c Version up to 8 cpu
Rating ELO: 2868
Zappa is a chess engine, or a program that plays chess. It is similar to Deep Blue - only much better - and is best known for its good parallel speedup and dead sexy author. It has competed in many computer chess tournaments with its best result coming at the World Computer Chess Championship in 2005, where it took first place with the score of 10.5 / 11. Like Fritz or Shredder, it is a standard chess engine, which in technical terms means it is a brute force alpha-beta searcher with a heuristical evaluation.
Zappa v1.1
Rating ELO: 2687
Crafty v. 21.14
Crafty is a chess program written by UAB professor Dr. Robert Hyatt. It is directly derived from Cray Blitz, winner of the 1983 and 1986 World Computer Chess Championships.
Rating ELO: 2630
Parrot
Rating ELO: 2100
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