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Subject: Re: Why using Zobrist keys for Pawn Hashing?

Author: Sune Fischer

Date: 08:02:23 12/05/01

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On December 05, 2001 at 10:52:39, Gerd Isenberg wrote:

>You are completely right. i meant the normal subtraction via twos complement. I
>intuitively made the totally wrong assumption, that the difference is unique if
>no bits are common in both operands - specially in a 64 bit word where only bits
>8-55 may set.
>
>Sorry for my nonsence and thanks for clarifying.
>
>Gerd

Well maybe the AND would work after all, hard to imagine two pawns reversing
squares but I guess it can happen.
Prof. Hyatt has a good point though.

-S.



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