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Subject: Re: How to use hashtable for bishops?

Author: Robert Hyatt

Date: 20:40:52 12/09/01

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On December 09, 2001 at 18:56:05, Pham Minh Tri wrote:

>On December 09, 2001 at 18:04:59, Matthias Gemuh wrote:
>
>>On December 09, 2001 at 17:55:43, Pham Minh Tri wrote:
>>
>>>On December 09, 2001 at 10:37:30, Robert Hyatt wrote:
>>>
>>>>On December 09, 2001 at 06:21:37, Pham Minh Tri wrote:
>>>>
>>>>>Someone told me that he used hashtable for bishops, but I do not understand how
>>>>>to do (unlike pawns, I found there was too little information to save for
>>>>>hashtable). Could someone explain to me or show me where to download the source
>>>>>code. Many thanks in advance.
>>>>
>>>>
>>>>You could, in theory, use special purpose hash tables for any evaluation
>>>>component that is costly to compute.  The danger is that this can become
>>>>very memory-intensive...
>>>
>>>Yes, but how? :)
>>
>>
>>Score batteries, pins, discovered checks, good/bad bishops, pairs, etc. :).
>
>Thanks, I undertand more. But could you explain more about pins and discovered
>checks? I think those factors concerns to many other pieces, not only bishops,
>so how to separate, compute and store them in hashtalbe?
>
>An other question: I know the mobility of bishop is expensive to compute, but I
>don't know how to save it in hashtable. Could anyone shed more light on this?
>Thanks.


This is correct.  If you just hash bishops, in the signature, then bishops
are _all_ you can include in the scoring.  IE if you include a pinned knight,
you will generate problems...



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