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Subject: Re: Hard K+P ending position

Author: Jeremiah Penery

Date: 21:36:08 06/29/03

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On June 29, 2003 at 18:16:58, Mike Byrne wrote:

>On June 29, 2003 at 15:30:03, Jeremiah Penery wrote:
>
>>[D]8/5p1p/8/6k1/8/6P1/5PP1/7K w - -
>>
>>This position was part of a test posted quite some time ago.  All the other
>>positions were solved without huge difficulty by programs, but this one was not.
>> I've seen a couple of times where programs come up with the first move, but
>>they don't really know what's going on.
>>
>>I want to see a program get the correct line with a decent score (more than +1
>>or so).
>>
>>The line is 1. Kh2 f6 2. Kh1! f5 3. Kg1 Kf6 4. Kf1 Ke5 5. Ke1 Kd5 6. Kd1 Ke5 7.
>>Kc2! Kd4 8. Kd2 Ke4 9. Ke2 h6 10. Kf1! Ke5 11. Kg1 Kf6 12. Kh2 Kg6 13. Kh3, and
>>now the win is not hard to find.
>
>Crafty v19.3 (2 cpus)
>
>               31->   3:13   1.02   1. Kh2 f6 2. Kh1 f5 3. Kg1 Kf6 4. Kf1
>                                    Ke5 5. Ke1 Kd5 6. Kd1 Ke5 7. Kc2 Kd4
>                                    8. Kd2 h6 9. Kc2 Kc4 10. f3 Kd5 11.
>                                    Kd2 Ke5 12. Ke3 h5 13. f4+ Ke6 14.
>                                    Kd4 Kd6 15. Kd3 Kd5 16. Ke3 Ke6

Even here, Crafty doesn't really know what's going on.

>Playing from the postion at G/25, it see mate on the 9th move.
>
>1. Kh2 f6 2. Kh1 f5 3. Kg1 Kf6 4. Kf1 Ke5 5. Ke1
>Kd5 6. Kd1 Ke5 7. Kc2 Kd4 8. Kd2 Ke4 9. Ke2  1-0

Sure, only because it plays the horrible 2. ...f5.



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