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

Author: Eran Karu

Date: 13:24:42 06/04/05

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On June 04, 2005 at 14:06:48, Rémi Coulom wrote:

>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

[D]6n1/3p4/8/1P1Pk1n1/4P3/B5K1/8/8 w - -

When my Shredder 9 UCI program analyzed that position above, I tweaked its
engine options and nothing helped so far! :-(

Eran Karu



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