Computer Chess Club Archives




Subject: Re: mate threat extension/null move

Author: Rick Bischoff

Date: 20:59:27 09/25/04

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I only do checks if a capturing move results in a check, then I just call
alphabeta with a depth of zero.

>>"found mate" never gets printed out in WAC141 unless I change the null move to a
>>full width search... Why?  Well, I shouldn't say never, but I let it run to ply
>Sigh. Do you do checks in quisce? No? If you do recursive R=2 with no checks in
>the qsearch, nullmove makes the search absolutely BLIND for mates in the last 3
>plies. Think about it, set the position up with this in mind and analyze it.
>Further if you use a window <alpha, beta> then you miss a large portion of mate
>threats anyway.

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