Another free, open-source computer chess engine is Crafty. This chess program is developed by Dr. Robert M. Hyatt. Nowadays in addition to him a small team of contributors is also constantly improving this strong chess engine. On the Crafty Chess page you can find additional information and links to the download pages.
Crafty can also be used to annotate your chess games.

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Another very strong chess engine is Houdini. The current version is widely considered to be the strongest chess engine available. As of December 17, 2010, Houdini 1.5 was ranked #1 on the leading IPON computer chess rating list, 50 Elo ahead of Rybka 4 and 100 Elo ahead of Stockfish 1.9 and Critter 0.9.
Houdini is free for non-commercial use. It can be downloaded from the Houdini Chess Engine website.
There you can also find more information about the name, usage and background of this strong chess engine.

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Stockfish is an open-source UCI chess engine that is available for Windows, Mac OS X and Linux. There is also an iPhone/iPad app.
It’s one of the strongest engines. It has an impressive rating of over 3200 ELO on most chess rating lists. More information and download at the Stockfish homepage.

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Another interesting chess site is the site of the World Chess Federation, FIDE. You can find a lot of chess news on this site as well as the calendar of FIDE events.
Other interesting parts of this site are the ratings and the FIDE handbook. You can have a look at the ratings of the top players as well as your own rating, as long as you have a FIDE rating. The site also shows your rating progress as well as your game statistics.
Regarding the FIDE handbook: this handbook also contains a section about the laws of chess.

However, the Chess news on the FIDE site is mainly for organizers, arbiters and trainers and not for chess players in general.

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