Author: Thorsten Greiner
Date: 07:57:08 02/26/99
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On February 25, 1999 at 00:12:53, Don Dailey wrote: >On February 24, 1999 at 19:16:27, Bruce Moreland wrote: > >> >>On February 24, 1999 at 15:37:58, Don Dailey wrote: >> >>>My program is a mixture of static rules and null move. I do null >>>move when I have significant depth remaining, but when I am near >>>end nodes I do a simple static attack analysis. This has proven >>>to be a significant improvement to my chess program. It is faster >>>than null move and slightly riskier, but the net affect is >>>a stronger chess program (for me.) Even though it's probably >>>riskier, it does pick up things null move will miss although the >>>converse is also true. >> >>Can you describe this or give examples please? I know that some people do this >>but I haven't the vaguest idea how it works. >> >>bruce > > [Nice story of Don Dailey deleted] > >I think there are probably several modern programs that use some >version of this static based selectivity, and Rebel is one of them. >Rebel may not do it anything like we did, but it shows that there is >more than one way to skin a cat! > >- Don It seems some other chess programmers also discovered the ideas you described. For example, Ernst Heinz of the german Dark Thought team describes a similar idea in his paper on extended futility pruning, where they apply static selectivity in the last three plies before the search horizon (see http://wwwipd.ira.uka.de/Tichy/DarkThought/ for this and other papers). Also Rainer Feldmanns (from Zugzwang) idea of FH-reductions aims at a similar direction: At each node in the tree, they reduce the depth of the subtree by one, if the static evaluation (backep up by some threat recognition) if >= beta. A link to the online version of his paper is found at http://www.uni-paderborn.de/fachbereich/AG/monien/PERSONAL/OBELIX/publications.html. -Thorsten
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