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Subject: Re: Verified Null-Move Pruning, ICGA 25(3)

Author: Andreas Herrmann

Date: 11:59:10 11/20/02

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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.
>
>
>pdf:  http://www.cs.biu.ac.il/~davoudo/pubs/vrfd_null.pdf
>zipped pdf:  http://www.cs.biu.ac.il/~davoudo/pubs/vrfd_null.pdf.zip
>gzipped postscript:  http://www.cs.biu.ac.il/~davoudo/pubs/vrfd_null.ps.gz

Hi Omid,

hmm seems interresting. Thanks for the paper. I will try it out in the next
days. Did you tryd your null move extension also in pawn endgame positions where
the most moves in the search tree are zugzwang?

Andreas







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