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Subject: Re: null move and mate threat

Author: Brian Richardson

Date: 13:24:40 10/09/04

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On October 09, 2004 at 07:42:56, David B Weller wrote:

>Uri,
>
>I too use wacnew [mostly for bug/error detection]
>
>I think that, since so many are solving wac141 without trouble, it implies there
>may be some particular deficiency in ga that needs addressing.
>
>GES has difficulty with finding Qg2+ in WAC.163. I dont know why.
>
>[D] 5rk1/2p4p/2p4r/3P4/4p1b1/1Q2NqPp/PP3P1K/R4R2 b - -
>
>It may be, in both GES and ga, that we have an imbalance or disproportionate
>extensions applied???
>
>Or, maybe it is something else. But the fact that these positions are so readily
>solved by others seems to suggest that possibly there is a bug/error someplace.
>
>The closest thing to a 'magic bullet' in chess programming is bug elimination -
>IMHO
>
>-David

I tried Crafty 19.17 with and without null move mate threats.

For WAC.163 it does not matter and finds Qg2+ in 3-4 seconds (Athlon 1.6GHz).
For WAC.141 it does make a difference (under 5 seconds v more than 30 without).

Brian





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