Author: Brian Kostick
Date: 04:56:07 04/09/04
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On April 08, 2004 at 08:56:29, Jonas Bylund wrote: >Is there a rule of thumb when it comes to selectivity, for example for long >analysis (and i do mean long) would it increase the engines performance to >increase the selectivity value? if one where to use TheKing for long analysis, >would it do better with sel=16 than say sel=12? > >Regards >Jonas Ok, from the Chessmater 8000 manual (note that CM9000 has other settings and limits): 1: Selective Search determines how sensitive the personality is to non-useful plies, when analyzing the possible positions in a game. 2: It sets the number of plies (from 1 to 12) that the personality looks at before making is next move. 3: Unless told to do otherwise, the personality considers all possible plies (which can be infinite in number) before making its next move. 4: This makes for slow playing by the personality. 5: The default is 6, which means the personality selectively disregards unpromising lines for the first six plies of the search. 6: Beyond the selective search, it does a brute-force search of all possible remaining moves. I broke it down by sentence since that is what I had to do to try and interpret the information. I'd suggest that 1, 5, and 6 give some useful impression. As I understand it, if you have infinite time, then the Selective Search should be lowered, not raised. FWIW, BK
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