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Subject: Re: Curious bug in Deep Fritz 7

Author: John Merlino

Date: 13:48:02 08/21/02

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On August 20, 2002 at 21:19:26, Rory Nolan wrote:

>On August 20, 2002 at 16:12:00, John Merlino wrote:
>
>>On August 20, 2002 at 16:01:52, Rory Nolan wrote:
>>
>>>In this position when Black plays Kf7 if I take the e pawn with my King Fritz
>>>immediately takes the a6 pawn with the white queen???? This has been entirely
>>>reproducable on my comp. I'm running XP on an athlon 1900+
>>>Anybody else get this?
>>>Rory
>>>
>>>[D}8/r7/P2Q1k2/4p3/4K3/8/8/8 b - - 0 58
>>
>>I don't have Fritz, but it sounds like it might be a bug due to you having an
>>incomplete set of endgame databases? If you have all of the necessary files (or
>>none of them at all), any program should play 59...Kg7, which leads to a Mate in
>>9. All other moves lead to a faster mate for White.
>>
>>Just my (probably worthless) input....
>Yes but...
>its performing an illegal move, taking its own pawn!!!
>Rory

Which can basically be described as "undefined behavior". It was just a guess as
to the cause. Is it 100% repeatable? Have you tried the position without any
access to tablebases?

jm



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