Author: Severi Salminen
Date: 00:38:48 01/05/01
Go up one level in this thread
>>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? >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
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