Computer Chess Club Archives




Subject: Re: Finding mate in the quiesce search

Author: Uri Blass

Date: 06:26:36 08/24/04

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On August 24, 2004 at 08:45:56, Alessandro Scotti wrote:

>What value do you return when you find a mate in the quiesce search? I used to
>return a "mate" score but then I found this is not correct because many paths
>were not considered in quiesce, so sometimes I got a "mate in n" score at the
>root which wasn't really a forced mate. I've patched the bug by returning a
>fixed value for now, but... which value is best?

I return mate.
I simply do not keep the mate backward.

If I have RxR RxR mate then the capture RxR is not good and I return the same
value that I return when RxR is illegal.

When you are in the qsearch you evaluate the position.
The evaluation of the position is a lower bound for the evaluation of the

you cannot return mate against the side to move if the side to move is not in
position that you search all of it's moves and the worst that you can evaluate
for that side is the static evaluation.


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