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Subject: Re: Difficult position for programs, at least for Crafty.

Author: Robert Hyatt

Date: 07:24:30 08/10/99

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On August 10, 1999 at 02:25:56, Bernhard Bauer wrote:

>On August 09, 1999 at 12:24:56, Robert Hyatt wrote:
>
>>On August 09, 1999 at 10:02:42, Bernhard Bauer wrote:
>>
>>>Hallo,
>>>
>>>recently I came across a position from a game
>>>Haenninnen - Szabo, Wageningen.
>>>
>>>The position is
>>>FEN: 3r1rk/pp1q2b/3p2pp/PP1Np2n/2Pp1p/B2P2Pb/3QPPBP/R4RK w
>>>
>>>The game went on
>>>19. Bxd6 Bxg2
>>>20. Bxf8 Qh3
>>>21. Bxg7 f3
>>>22. exf3 Bxf3
>>>23. Ne3  Kg7
>>>24. Qb4  Rd7
>>>25. Ra2  Nf6
>>>White resigned.
>>>
>>>Programs have difficulties to find out that 19. Bxd6 is bad.
>>>The whole line seems to be difficult at least for Crafty.
>>>BTW Crafty produces a lot of debug messages on a Sun, not on a PC.
>>>
>>>Enjoy
>>>Bernhard
>>
>>
>>What is "a lot of debug messages"?  If you are getting oddball error messages
>>then something is definitely wrong...
>>
>Messages like this:
>captured a king
>piece=5,from=51,to=44,captured=3
>ply=16
>My logfile is 5.2 Mb in size.
>
>
>>As far as the position goes, the end has a B on F3, Q on h3, which is a known
>>"null-move" killer...
>
>Oh, not known to me. But I feared it would be a null move problem again -:)
>Kind regards
>Bernhard


That is definitely bad.  Such errors should never occur, and are only present
to catch errors that I introduce when changing the code...  Can you post a
FEN for aposition that will produce such an error?




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