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Subject: Re: passed pawn evaluation.

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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