Author: Uri Blass
Date: 05:29:12 06/04/02
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On June 04, 2002 at 07:17:03, Vincent Diepeveen wrote: >On June 04, 2002 at 02:33:55, Russell Reagan wrote: > >I have been wasting a lot of time in search past years. > >Like last months i have wasted my time working on forward pruning. > >Sure i can search 3 ply deeper with it (and kicking out singular >extensions and other extensions). > >However if i do that, then it scores simply 20-25% worse in tests >against commercial programs. > >The reason was not so hard to find for me. It simply goes for 1 >move and stays with that move. The rest gets forward pruned. Chances >to find a superb move is way smaller. In this case it is a bad way of using forward pruning. The idea of forward pruning is to prune tactical blunders and not to prune positional moves. Forward pruning that is done only when you lose a lot of material and the remaining depth is small enough is a productive forward pruning. This is the first pruning that I added to movei even before null move pruning. I have some more conditions in my program to help it not to miss sacrifices by that pruning and I found that this pruning helped Movei to be better not only in games but also in test suites. Uri
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