Author: Omid David Tabibi
Date: 11:38:46 11/20/02
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On November 20, 2002 at 14:32:40, Uri Blass wrote: >On November 20, 2002 at 11:43:10, Omid David Tabibi wrote: > >> >> ICGA Journal, Vol. 25, No. 3, pp. 153-161, September 2003 >> >> >> Verified Null-Move Pruning >> >> Omid David Tabibi and Nathan S. Netanyahu >> >> >> Abstract >> >>In this article we review standard null-move pruning and introduce our extended >>version of it, which we call verified null-move pruning. In verified null-move >>pruning, whenever the shallow null-move search indicates a fail-high, instead of >>cutting off the search from the current node, the search is continued with >>reduced depth. >> >>Our experiments with verified null-move pruning show that on average, it >>constructs a smaller search tree with greater tactical strength in comparison to >>standard null-move pruning. Moreover, unlike standard null-move pruning, which >>fails badly in zugzwang positions, verified null-move pruning manages to detect >>most zugzwangs and in such cases conducts a re-search to obtain the correct >>result. In addition, verified null-move pruning is very easy to implement, and >>any standard null-move pruning program can use verified null-move pruning by >>modifying only a few lines of code. > >Some comments: > >1)If I understand correctly your idea let the computer to find every idea that >is based on one zugzwang after enough time but not ideas that are based on more >than one zugzwang. > >Am I right? > I think it will manage to detect almost all zugzwang positions and find the correct move through a re-search. However, I think the most important contribution of verified null-move pruning will be in middle game, as it will enable a deeper, more accurate search. >2)I guess that it is not good news for Amir Ban because it seems that most of >the null move pruning programs like Fritz are going to earn rating when Junior >cannot because it does not use null move prunning. > Now that many of null-move's shortcoming have been addressed, I believe Shay and Amir will also incorporate null-move pruning in their program. Omid. >Uri
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