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Subject: Re: Pawn Torture tests?

Author: Koundinya Veluri

Date: 11:49:21 09/26/01

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On September 26, 2001 at 13:59:25, Miguel A. Ballicora wrote:

>On September 26, 2001 at 13:26:18, Koundinya Veluri wrote:
>
>>On September 26, 2001 at 07:01:43, Jouni Uski wrote:
>>
>>>On September 25, 2001 at 22:56:30, Koundinya Veluri wrote:
>>>
>>>>Here's a good one I just found today in Franks's little test tournamet:
>>>>
>>>>Leila - King of Kings
>>>>
>>>>[D]6B1/1pp3p1/3p4/n1k2P2/2P3P1/4K3/8/8 b - - 0 40
>>>>
>>>>I think black already lost here, but
>>>>
>>>
>>>No, after Nc6 result is 0,5-0,5. White cannot make any progres.
>>>
>>>Jouni
>>
>>Yes sorry, I didn't think about this too much. One thing though, Crafty doesn't
>>get this immediately like I said before. I just got confused with its different
>>scoring style (negative=positive for black). It takes most programs a long time
>>to avoid Nxc4.
>>
>>Koundinya
>
>Which one avoids it? what is the PV?
>I tested this with my program and I think that it does not avoids it for the
>right reason. Is not black winning?
>
>   2634164   9      16.4    +1.91  Na5xc4   Bg8xc4   Kc5xc4   g4-g5
>                                   Kc4-d5   Ke3-f4   g7-g6    f5xg6
>                                   Kd5-e6   Kf4-e4   c7-c6    Ke4-d4
>                                   b7-b5    g6-g7
>
>4... g6! is the winning move, otherwise black loses. (5. g6! and 6.f6 is the
>threat).
>
>How is white supposed to play?
>
>Regards,
>Miguel

Analysis with Yace tells me that after 4... g6 5. Kg4! wins for white. If black
captures 5... gxf5, the white pawn promotes. If it doesn't capture but tries
something like 5... b5, then 6. fxg6 Ke6 7. Kh5 wins for white.

Koundinya



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