"Theory is when you know all and nothing works. Practice is when all works and nobody knows why." - Albert Einstein

Vafra (Crafty clone) chess engine

Crafty v20.12.rj7 is a modified Crafty v20.12: added EL of AEL pruning as suggested in Ernst A Heinz, Scalable Search in Computer Chess, used Heinz's criteria in A of AEL pruning, added in search, as Robert calls it, Rybka's evaluation extension, some extension and fine tuning of chess knowledge. Crafty was searching over 10 million positions per second (only 20 times slower than Deep Blue). Crafty used opening book, built from Hyatt's and Corbit's joint game database (containing over 2 million games), with 342,768 unique positions (book.bin 6.78 MB). Crafty used all 3-, 4- and 5-piece endgame Nalimov tablebases (7.05 GB). Crafty used 3,072 MB for the transposition/ refutation hash table and 512 MB for the pawn structure/ king safety hash table (hash=3072M, hashp=512M, cache=8M).

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Updated on 22nd of February 2010