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Subject: Re: Forced mate so solve...

Author: leonid

Date: 14:59:54 02/05/01

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On February 05, 2001 at 08:56:32, Uri Blass wrote:

>On February 05, 2001 at 08:07:35, Christophe Theron wrote:
>
>>On February 05, 2001 at 07:23:58, leonid wrote:
>>
>>>Hi!
>>>
>>>If you like to solve forced mate position full of "depleted uranium"...
>>>
>>>[D]NKBN4/QRQ3rR/2Qb2r1/N1b1nb2/B2nbbbB/1RNqqqq1/8/2N2k2 b - -
>>>
>>>Please, indicate your result.
>>>
>>>Thanks,
>>>Leonid.
>>
>>
>>Chess Tiger 14 (experimental version) finds:
>>* a mate in 11 in 6.21s (Bxa7+...)
>>* a mate in 9 in 15.27s (still Bxa7+...)
>>on a K6-2 450 with 6Mb hash tables.
>>
>>
>>    Christophe
>
>It gives a good competition to chessmaster6000(ss=10).
>
>Chessmaster6000 can see mate in 10 in 1 second but needed 17 seconds to see mate
>in 9 on my PIII450(128 mbytes hash).
>
>Is your experimental version a version for playing games and not for finding
>mates?
>
>Chessmaster is for playing games and I guess that the programmer could do it
>faster in finding mates if this was his target.
>
>Uri

Thanks, Uri, for finding that mate in 9!

Actually, when I created this position yesterday, I found mate in 12 by
selective search in 12 moves. After seeing that mate existe in 9, I came to look
more carefully 9 move by changing certain variable. It is accessible all the
time for obtaining on the fly all kind of selective searches. Mate in 9 came
instantly, just like you said.

LLchess mate solver. AMD 400Mhz. No hash.
For 12 and 9 moves mate came at the same time - 0.33 sec.
For 9 moves:  Bishop C5-A7 and Knight D4-C6.
For 12 moves: Knight E5-C6 and Knight D4-C6.

I not searched all posible moves for indicated depth. Two responses for the same
depth came when search was done by two different versions of selective search.

Leonid.




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