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=

1998 ...

 * Hash tables and data-cache, some programmer stuff... by Ed Schröder, CCC, January 17, 1998

2000 ...

 * Pawn and Eval hash tables by Peter Fendrich, CCC, January 21, 2001
 * Evaluation cache by Klaus Friedel, Winboard Forum, April 03, 2006 » Snitch

2010 ...

 * 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
 * Using evaluation hash score as current bestscore (initial guess) by Vivien Clauzon, CCC, June 06, 2019
 * Eval hashtable replacement scheme by Pawel Koziol, CCC, October 08, 2019

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