Author: Jon Dart
Date: 15:59:20 12/03/02
Go up one level in this thread
On December 03, 2002 at 17:16:58, Robert Hyatt wrote: > >the idea is to do anything you can to exclude moves. Because below each move >you search, you grow a tree, and that is expensive. If alpha is 0.00, and >the current material score is -15.0, then capturing a pawn is not going to >help, and avoiding that capture avoids the tree below it. I've noticed that Crafty uses the material value as a basis for calculating futilty. In other words, if material + SEE gain + safety margin < alpha, you cut the move (I do something similar at present). What Mike is suggesting is to use the total position eval, which is also something I've experimented with. So: if eval + capture + SEE gain + safety margin < alpha, you cut. If you have large positional scores, this is possibly safer (the "safety margin" in Crafty is only 1 pawn). --Jon
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