Author: Uri Blass
Date: 13:58:21 08/26/05
Go up one level in this thread
On August 26, 2005 at 14:54:32, Robert Hyatt wrote: >On August 26, 2005 at 14:21:34, Alvaro Jose Povoa Cardoso wrote: > >>Hi, >>some of you compare the number of times a move failed high to the number o times >>the same move failed low in order to decide if a move can be reduced one ply. >>I've tested this and also tested using the actual values of the history table >>(using of course another history table for fail lows). >>I couldn't reach a conclusion though. >>What is your experience on this? >> >>best regards, >>Alvaro > > >My first thought is that the number of "fail lows" is irrelevant. What you >really want to avoid is a reduction on a move that might fail high. Any move >will fail low in some situations, but you want to handle the "typical" case >correctly and not reduce if there is a reasonable chance the reduction will hide >something. I think that it is relevant. If a move was never tried and never had an option to fail low then you do not want to reduce it. If you know that a move failed low many times but did not fail high then it seems more safe to reduce it. Uri
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