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

Author: Omid David Tabibi

Date: 07:24:52 11/21/02

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On November 21, 2002 at 10:15:47, Bernhard Bauer wrote:

>Hi Omid,
>
>would you implement your pruning technique in crafty so the benefits could be
>tested by everybody?
>That way we would have the best comparison.
>

I couldn't (and didn't have time to) understand Crafty's complex source code. I
think it'd be better for Bob to do the implementation, and then, I can look at
it to solve possible problems.

Omid.



>regards
>Bernhard
>
>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



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