Author: Jarkko Pesonen
Date: 23:39:21 05/06/03
Go up one level in this thread
On May 06, 2003 at 18:36:37, Ricardo Gibert wrote:
>On May 06, 2003 at 08:55:07, Robert Hyatt wrote:
>
>>On May 06, 2003 at 07:05:02, Jarkko Pesonen wrote:
>>
>>>Crafty 19.3 ends up in this position
>>> white black
>>> 1 d5 e5
>>> 2 c6+ bxc6
>>> 3 bxc6+ Kc8
>>> 4 d6 e4
>>> 5 Kd4 h5
>>> 6 g4 hxg4
>>> 7 hxg4 f4
>>> 8 Kxe4 ...
>>>
>>>[D]2k5/8/2PP4/6p1/4KpP1/8/8/8 b
>>>
>>> 21-> 1:40 6.47 1. ... Kd8 2. Kd4 Kc8 3. Kd3 Kd8 4.
>>> Ke4 Kc8 5. Kf3 Kd8 6. Kf2 Kc8 7. Ke2
>>> Kd8 8. Kd3 Kc8 9. Kc3 Kd8 10. Kd2 Kc8
>>> 11. Ke1 f3
>>>
>>>Seems that crafty isn't doing any progress and score is totally wrong(seems to
>>>be draw).
>>>
>>>Is there an easy way to fix this?
>>>Or is this some kind off odd situation that is so rare that it is not
>>>worth fixing?
>>>
>>>Jarkko
>>
>>
>>That can be fixed. It is the classic problem of two connected passed pawns
>>being valued too high in a king and pawn ending. If they were separated,
>>white would win easily. But together, they can be stopped. I will look
>>at this and fix it. The code is already there, it just has a hole that I
>>apparently overlooked.
>
>From the diagrammed position:
>
>1...Kd8 2.d7 Ke7 3.Kd4 Kd8 4.Kd5 Ke7
>
> if 4...Kc7? 5.Ke6 f3 6.Ke7 7.f2 e8=Q+ wins more easily.
>
>5.Kc5 f3 6.Kb6 f2
>
> if 6...Kd8? 7.Kb7 f2 8.c7+ Kxd7 9.c8=Q+ wins more easily too.
>
>7.Kc7 f1=Q 8.d8=Q+ looks like a win to me.
You mean that the original position wasn't draw after all.
Can you refute moves
white black
1 d5 e5
2 c6+ bxc6
3 bxc6+ Kc8
4 d6 e4
5 Kd4 h5
6 g4 hxg4
7 hxg4 f4
8 Kxe4 ...
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