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Subject: Re: One (small) example where the Shredder selectivity fails

Author: Rémi Coulom

Date: 11:06:48 06/04/05

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On June 04, 2005 at 13:07:29, Ernest Bonnem wrote:

>[D]6n1/3p4/8/1P1Pk1n1/4P3/B5K1/8/8 w - -
>
>White to win
>
>Here Shredder 9 UCI cannot find the "simple"  b6! even at depth 36/61 (searching
>more than 2 hours on my computer)
>
>b6 is found almost immediately by all other programs I tried (Fritz 7, Tiger,
>Pharaon,...)
>
>Has anybody an explanation ?

null move hides a zugzwang, maybe. After b6 Nxe4+ Kh4 Nd6 Bxd6+ Kxd6 Kg5, black
is in zugzwang, if I understand correctly.

It is really not very wise to do the null move in such a situation. I would find
it strange if Shredder has such a hole. So Shredder's problem may be a little
more subtle. It is hard to guess.

Rémi



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