Computer Chess Club Archives




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

Author: Uri Blass

Date: 22:14:32 01/21/01

Go up one level in this thread

On January 21, 2001 at 19:39:16, Pete Galati wrote:

>On January 21, 2001 at 19:26:43, Paul wrote:
>>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:
>>>>>>>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.
>>>>>>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 ;)
>>>>>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 :)
>>>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).
>>Well, I *was* waiting for your solutions from Comet & Junior ...
>>or have you been rebooting al this time ;)
>Oops, I must be becoming known for what I run analysis through, but I figure
>everyone else will use Fritz and Crafty etc., so why should I?

It is not truth.

I used Junior to find the mate in 12 line and not Fritz and Crafty.

Fritz and Crafty are not good programs to use in complicated positions when both
sides have 9 queens.

>Actually, I've been running Junior on that other position that you pasted in
>that you said you gotta go deep to get an answer on, and Junior doesn't seem to
>be coming up with anything (that I know of)'

>New position
>5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 1

You seem to use always the wrong program.
Junior is the wrong program to solve mate in 30 when Rebel solves it with no


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