Author: Gerd Isenberg
Date: 12:49:00 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; Hi Don, a really nice lever to tune on tactial positions. New to me and interesting - thanks for sharing! Moving twice in a row but only archiving a small positional improvement considers first move already bad enough to prune it - hmmm. I guess during game play it is also worth to lose some extra games due to poor positional play and seeing tactics against itself a bit earlier ;-) What about keeping WACBOOST variable, probably initialized by evaluation or some eval related heuristics to determine some metric of tactical aspects for both sides, like en-prised pieces, hanging pieces, pins, possible checks, forks, king safety, weak as well as passed pawns, etc? Cheers, Gerd
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