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Subject: Re: here it is.

Author: Heiner Marxen

Date: 19:27:36 01/17/01

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On January 17, 2001 at 19:41:34, leonid wrote:

>On January 17, 2001 at 18:43:43, Paul wrote:
>
>>On January 17, 2001 at 18:18:34, leonid wrote:
>>
>>>On January 17, 2001 at 18:10:38, Paul wrote:
>>>>
>>>>My program says mate in 9 for black ... here's a line:
>>>>
>>>>1... Qxb4 2. Rg8+ Ne8 3. Nxe4 Ncxb3+ 4. cxb3 Nxb3+ 5. axb3 Qxa3+
>>>>6. bxa3 Qcc3+ 7. Nxc3 Qxc3+ 8. Ka2 Rd2+ 9. Bc2 Qexb3x
>>>>
>>>>Paul
>>>
>>>Can you indicate by what program you solved and all basic data about solution?
>>>Selective or brute force search, hash table, special mate solver or usual chess
>>>game. Speed of your computer.
>>>
>>>Thanks,
>>>Leonid.
>>
>>Hi Leonid ...
>>
>>It's my own program 'Pretz', selective nullmove search, 48MB hash, usual
>>chess program, 400MHz PII. So it's possible there's a shorter mate.
>>
>>Don't know the exact solving time, cause I had more things running
>>at the same time, but it was a couple of minutes.
>>
>>Paul
>
>Thanks!
>
>Pretty new for me to see that nullmove could be used as some kind of selective
>search for mate.
>
>It is possible that 9 moves is the shortest move. I only found that mate is
>between 11 moves and 7. Six moves I looked through brute force. In six mate not
>existe.
>
>Brute force, even 6 moves took on mine around 6 minutes. Branching factor looked
>very bad for this position. With similar branching factor and having no hash in
>the program, I thought that looking for exact solution will be too long.

Chest says there is no mate in 7.  214 seconds K7/600 with 20 MB hash table.
Since I have already running a long job, it will take some time to
complete depth=8.

Heiner


>Please indicate address of your program, if it is complet chess program (not
>engin) and if it free. Curious to see if I already know it.
>
>Thanks,
>Leonid.



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