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Subject: Re: Help with strange tablebase output - Crafty-18.6 & Fritz6

Author: Mike S.

Date: 03:40:59 03/17/01

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On March 16, 2001 at 16:13:55, Uri Blass wrote:

>(...)
>>How can Fritz6 see the win in the first position and not see it in the second?
>>The most obvious move, 2. Rf1+, isn't even listed in the engine output!?
>
>There is nothing strange.
>
>2.Rf1+ is leading to repetition after Kg7 so Fritz probably evaluates it as a
>draw.
>
>It is not relevant for games because Fritz is not going to play 1.Rg1+

It's not relevant in this case, but Fritz 6 has problems with tablebases &
repetition. This is a known issue. I remember another example which was
discussed in the CSS Forum (with Mathias Feist and others) some time ago, where
Fritz blundered in a tb situation by wrongly repeating a position. This was out
of a "natural" move sequence, not after a deviation like 1.Rg1+ here.

Nobody is perfect.

Regards,
M.Scheidl



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