Author: William Bryant
Date: 17:17:49 06/30/04
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On June 30, 2004 at 19:59:12, Stuart Cracraft wrote: >On June 30, 2004 at 19:50:23, William Bryant wrote: > >>I am looking for suggestion or references for setting the Delta value in the >>QSearch used to filter captures. Those captures that don't exceed the Delta >>value are pruned even though they may be winning captures. >> >>Thanks in advance. >> >>William > >Can you elaborate on what the delta value is? The idea behind the delta value is that if you are already behind a substantial amount of material, then captures, even winning captures, that only generate a small material gain are a waste of time in the qsearch. Therefore, in you call to generate the moves for the qsearch, you pass a delta value. It the SEE value from the capture does not meet or exceed this value, then this capture does not need to be searched at this time because in the end, it won't make a difference. My old program used the followng: long Delta = alpha - DeltaWindow - (MATERIAL); gen_caps(Delta); where DeltaWindow is an amount of tolerance and MATERIAL is the material balance at this point I am looking to update this information as I rewrite my program. Ideas and suggestions please. William
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