Author: Tord Romstad
Date: 02:23:24 01/13/04
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On January 12, 2004 at 20:21:45, Robert Hyatt wrote: >You can hash _everything_ about pawns, just so your scores have _only_ >information about pawns in them. But scores of any kind are *never* computed only on the basis of the locations of pawns. That's why it doesn't make sense to store any scores in the pawn hash table. The proper way to use a pawn hash table is to store some of the pawn structure related information you need to compute scores. I store the locations of all passed, isolated, double and backward pawns, the number of pawns on black/white squares for each side, the number of blocked (by enemy pawns) pawns on black/white squares, the open files, the type of central pawn structure (with possible values like OPEN, CLOSED, SEMI_CLOSED, W_STONEWALL, B_STONEWALL, FRENCH and so on) and some other similar stuff. My pawn hash entries are quite big, currently 128 bytes. Tord
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