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Subject: Re: Question for Gerd: reduce rbb lookup tables

Author: Bas Hamstra

Date: 14:50:04 07/14/03

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On July 14, 2003 at 17:34:58, Russell Reagan wrote:

>On July 14, 2003 at 17:15:50, Bas Hamstra wrote:
>
>>A while ago, in Leiden, Frans mentioned you had a trick to reduce the rotated bb
>>lookup tables by a factor 2, without further disadvantages. It had something to
>>do with the edges of the board, some "ray-states" you can ignore. I didn't
>>understand his short explanation back then. Could you explain?
>
>Hi Bas,
>
>Out of curiosity, how large are the lookup tables you currently use for rotated
>bitboard attack generation?
>
>Thanks,
>Russell

plain old 512k. It seems that is overdone...

Bas.





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