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Subject: Re: If you want solve one mate...

Author: leonid

Date: 14:25:53 01/21/01

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On January 21, 2001 at 16:56:42, Paul wrote:

>On January 21, 2001 at 11:56:09, leonid wrote:
>
>>Hi!
>>
>>This mate position is very handy when you want to check the limits in your
>>program. It is amusing also. Number of legal moves for both sides is slightly
>>over one hundred.
>>
>> knq3q1/rq1q1qbQ/Qq2Q3/1Qn1Q2B/Q1qN1Q1r/4K1B1/1q4QR/1N1q3Q white to go.
>>
>>If you will solve, it will be nice if you will indicate your result.
>>
>>Thanks,
>>Leonid.
>
>Hi again Leonid!
>
>It took my program 45 minutes ... phewwwwwww!
>Here's the line, a mate in 12:

If you program found mate in 12 moves ahead, in this situation, it is rock
solid!


>1. Qxa7+ Qxa7 2. Qxa7+ Kxa7 3. Qeb6+ Ka8 4. Qgxb7+ Qdxb7 5. Qxb8+ Qxb8
>6. Qxb8+ Qxb8 7. Q6a5+ Na6 8. Qaxa6+ Qa7 9. Qg8+ Bf8 10. Qxf8+ Qe8+
>11. Qfxe8+ Qc8 12. Qxc8x
>
>I think I'm going to skip your next problem, that will be too difficult
>for me ;)

This was surprise for me! Only when Heiner found that there is no mate in 10
that I understood that this position is very deep. My program will never see all
those 12 moves completely. Too much time. I create all my positions by using my
selective search. I try to find what is the minimum number of moves that lead to
the mate but not beyond 6. For this I should have, at least, better computer and
hash in my program.

Greetings,
Leonid.


>Greetings,
>Paul



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