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Subject: Re: Rybka is not perfect! It doesn't see mate in 4!

Author: Alessandro Scotti

Date: 23:38:46 12/05/05

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On December 05, 2005 at 19:14:46, Martin Giepmans wrote:

>I guess many other engines will also not find it. Mine only finds it when I
>enable verification search (which is default off).
>It's a null move problem.

I don't know... Kiwi has no null move tricks yet no problems with this pos:

 3/ 0 -34.04  00:00         7  Nb6
 4/ 0 -34.04  00:00        17  Nb6 Qa1 Nxc4
 5/10 -33.96  00:00        39  Nb6 Qa1 Nxc4 Qa2 Nd6 Qa1 Ne4
 6/ 4 -33.96  00:00       113  Nb6 Qa1 Nxc4 Qa2 Nd6 Qa1 Ne4
 7/ 0     M4  00:00       734  Nb6 Qa1 Nxc4 Qa2 Na5 Qa1 Nxb3+
 8/ 0     M4  00:00      1380  Nb6 Qa1 Nxc4 Qa2 Na5 Qa1 Nxb3+
 9/ 0     M4  00:00      2462  Nb6 Qa1 Nxc4 Qa2 Na5 Qa1 Nxb3+



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