Computer Chess Club Archives




Subject: Re: Forced mate so solve...

Author: leonid

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

Go up one level in this thread

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:
>>>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.
>>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
>Chessmaster is for playing games and I guess that the programmer could do it
>faster in finding mates if this was his target.

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.


This page took 0.02 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.