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

Author: Robert Hyatt

Date: 19:34:57 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

you can have exact mate scores, _and_ mate bounds.  They both can be stored
just fine if you don't have bugs.  The main point is to adjust a mate score/
bound so that it is mate in N from the current ply, rather than mate in M
from the root...





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