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Subject: Re: regular hash key & pawn hash key together--good idea?

Author: Andrew Dados

Date: 09:10:24 09/16/99

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On September 16, 1999 at 04:00:43, Tom Kerrigan wrote:

>If you have a program with 64 bit hash keys, is it a good idea to devote n bits
>to pawns and the rest to pieces and side-to-move?
>
>I was thinking a good balance may be 24 bits for pawns, but I have no data to
>back this up. Does anybody else?
>
>-Tom

 This is one cool idea to consider especially while our nps goes up a bit every
year... At one point 64 bit hash will not be sufficient, so then 64 bit piece
and 32 bit pawn signature would work great. However for now, if your hashkey
calculation is incremental and involves xor function, overhead of separating 24
bits from it is quite comparable to calculating second pawn hashkey, I think
(saving of some 10-20 clock ticks is simply not worth the headache).

 -Andrew-



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