Evaluation Hash Table

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An Evaluation Hash Table may be used in a similar fashion as the transposition table, that is using Zobrist- or BCH-hashing, to cache various computational expensive positional evaluation scores and flags. Despite the fact that the transposition table entries may contain evaluation scores as well, a tighter, dedicated evaluation hash table with its own replacement policy may gain a considerable amount of additional hits.

See also

• BCH Hashing
• Hash Table
• Material Hash Table
• Pawn Hash Table
• Transposition Table
• Zobrist Hashing

Forum Posts

• Hash tables and data-cache, some programmer stuff... by Ed Schröder, CCC, January 17, 1998
• Evaluation cache by Klaus Friedel, Winboard Forum, April 03, 2006 » Snitch
• Stockfish 1.8 - eval cache by Ralph Stoesser, CCC, July 18, 2010 » Stockfish
• crafty eval cache by Alvaro Cardoso, CCC, January 01, 2016 » Crafty
• hash eval, hash pawn or twice ? by Daniel Anulliero, March 19, 2016 » Pawn Hash Table

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