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

Author: Heiner Marxen

Date: 16:28:07 01/21/01

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On January 21, 2001 at 19:24:32, Pete Galati wrote:

>On January 21, 2001 at 19:17:18, Paul wrote:
>
>>On January 21, 2001 at 19:14:08, John Coffey wrote:
>>
>>>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:
>>>>
>>>>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 ;)
>>>>
>>>>Greetings,
>>>>Paul
>>>
>>>Fritz 6 has been thinking for 3 hours and 45 minutes, shows no analysis and
>>>still says 1/1 ply.  I wonder what is happening with the transposition table,
>>>:-).
>>>
>>>John Coffey
>>
>>:)
>>
>>It's the QSearch blowing up, you have to control that somehow ...
>>and that's easier when you're the author of the program in question :)
>>
>>Paul
>
>I'd try rebooting and try again.  Something sounds broken with searching on a
>position for 3 hours and being at 1/1 ply.  That's just not right (Louie
>Anderson impression).
>
>Pete

After 2:27 hours crafty is at 12/104 in depth=1.
May be that is just normal for programs, which do not use the hash table
in the quiescence search.

Heiner



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