Author: Stuart Cracraft
Date: 09:17:27 07/02/04
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On June 30, 2004 at 20:17:49, William Bryant wrote: >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 Thankyou for your note. I'll take a look at Delta after SEE.
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