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

Author: Robert Hyatt

Date: 17:29:49 08/09/99

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On August 09, 1999 at 19:05:06, Dave Gomboc 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...
>>
>>As far as the position goes, the end has a B on F3, Q on h3, which is a known
>>"null-move" killer...
>
>Would it be too costly to detect that there is a bishop on f3 and a queen on h3
>and an unprotected g2 or h1 and decide to extend? :-)
>
>Dave

No.. but it would be costly to detect Qh3 and P/B at f3, or a B at e4, d5, c6,
b7 or a8, or a Q at f3, and a B/P at h3, etc...

Same 'general' case, but different from the computer's perspective...  :)

Bob



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