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Subject: Re: Storing AB Bounds for mate scores... what is correct?

Author: Russell Reagan

Date: 20:45:15 05/13/03

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On May 13, 2003 at 21:30:01, John Boyd wrote:

>Hi all,
>
>Usually, a mate score is greater than beta and thus is stored as a LOW BOUND in
>the hash table.
>
>But why? Assuming its the true score, shouldn't it be stored as an EXACT score?
>
>I guess the problem is in assuming it is indeed the shortest mate. Is that why?
>
>Thanks,
>
>Ross

http://www.brucemo.com/compchess/programming/matehash.htm

This article by Bruce Moreland discusses the issue you are talking about, I
think. He says it's more headache than it's worth to store the mate score as an
exact score because of the translation that you have to do.



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