Author: Robert Hyatt
Date: 06:55:43 01/05/01
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On January 05, 2001 at 03:38:48, Severi Salminen wrote: >>>So this is like doing a more accurate futility pruning in qsearch. Do you use >>>the same margin as in futility pruning (I use 2 pawns). If I have understood >>>right, futility pruning in normal search does only need to know the value of >>>piece being captured, not the true swapoff value so SEE doesn't help there. >>> >>>Severi >> >> >>I think I use one pawn. But my original "estimate" is not really just the >>material score, it is a true call to Evaluate() since this has to be done to >>fill in the "stand pat" score anyway. It is very unlikely a single capture >>will change the material score in a huge way except when the last piece is > >You mean the positional score? Yes. Brain-dead at times. :) > >>removed, etc... and you can factor that in.. > > >>You can use just the value of the piece being captured for futility pruning, >>but it is more accurate to use the SEE score instead, as it is a better >>estimate of what will happen... > >Yes, of course now that I think of it: if the score after only the first capture >as <=alpha then it must definitely be lower using the see score and with see >you'll get much more moves pruned. > >Severi Correct.
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