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Subject: Re: Pawn hashing without Zobrist keys

Author: Sune Fischer

Date: 01:48:48 09/13/03

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On September 12, 2003 at 17:02:04, Gerd Isenberg wrote:
>
>Yes, but if "key" is whitePawns-blackPawns, bitboards as 64-bit ints, you may
>loose some pawns. That's the advantage with zobrist keys.

True.
I've never tried the subtraction, interesting idea.
I would guess, that it doesn't spread as good as random zobrist keys, but it may
not be a big issue for a pawn hash.

>I guess a 32-bit key,
>incremental updated if pawn structure changed, is good enough to address the
>pawn hash table.

Why consider 32 bit?
You have the 64 bit zobrist table already in cache.

You're a bitboarder, think 64 bit and drop the 32 bit kludges.. ;)

-S.
>Gerd




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