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Subject: Re: Pawn Torture tests?

Author: Miguel A. Ballicora

Date: 12:35:37 09/26/01

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On September 26, 2001 at 14:49:21, Koundinya Veluri wrote:

>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

Great move!
I think that the original position is a great test then. It should be "am Nxc4"
in the epd record.
thanks!

Miguel





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