Author: Ricardo Gibert
Date: 15:36:37 05/06/03
Go up one level in this thread
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.
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