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Subject: Re: Bug in Nimzo 7.32 engine?

Author: James T. Walker

Date: 06:30:31 09/24/99

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On September 24, 1999 at 00:45:45, Steve Maughan wrote:

>I gave Nimzo 7.32 the following test position
>
>r2b1qrk/ppp3pp/3p1p2/4pPPQ/4P2P/3PB3/PPP5/1K4RR w - - 0 1
>
>It's mate in 4 via 1.Qxh7+ Kxh7 2.g6+ Kh8 3.Rg5 fxg5 4.hxg5 mate.  The position
>is simple for todays programs to solve.
>
>However giving Nimzo the white pieces it immediately announces mate in 2!!  Now
>I can accept that it is reasonable to announce mate in more than 4, but not
>less.  Also after playing 2.g6 it announces mate in 1, and then after Rg5 and
>hxg5 it claims mate in 0.
>
>I assume that this is a minor bug in the engine.  It really should be sorted out
>as it means that Nimzo cannot be trusted to give shortest mates.
>
>Regards
>
>Steve Maughan

Hello Steve,
This is not new for Nimzo!  Nimzo 99 has similiar problems.  In fact when given
this position my Nimzo99 instantly plays Qh7+ and annouces mate in 1!  After KxQ
it plays g6+ & mate in 1 again.  So it's an old story.  I didn't know who to
tell about this except Chessbase but I don't think they care and I don't think
they passed this info on to the programmer.  If they did then he doesn't care.
Jim Walker



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