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Subject: Re: mate threat extension/null move

Author: Stuart Cracraft

Date: 16:12:13 10/05/04

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On October 05, 2004 at 05:57:36, Don Beal wrote:

>>by this:
>>    // test for null move prune
>>    value = -search(bd,sdepth-1-reduction,ply,-beta,-beta+1,
>>	mvstr,SAVETOP,verify,REDUCENOTOK,checked) + WACBOOST;
>>where WACBOOST is a bias that increases tactical prunes.
>
>Correction to my last post.  That should have been:
>
>  value = -search(bd,sdepth-1-reduction,ply,-beta+WACBOOST,-beta+1+WACBOOST,
>	mvstr,SAVETOP,verify,REDUCENOTOK,checked) + WACBOOST;

Tried it -- but no big boost at settings of 1/4 pawn and 1/2 pawn.

Either no boost or boost <= 1%. Can't tell without a more thorough
hour long test which I hope to run this week. Thanks for providing
this new idea for research.

Stuart



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