Computer Chess Club Archives




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

Author: leonid

Date: 10:16:22 01/21/01

Go up one level in this thread

On January 21, 2001 at 12:43:34, Heiner Marxen 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.
>A hint to you, Leonid:  if you like to see a diagram for the notation above:
>(1) Stick a [D] directly before the FEN string,
>(2) append (blank seperated) colour to move, i.e. b or w
>(3) append (blank seperated) castling rights: - for nothing, KQkq or part
>    of it for white/black king side/queen side
>(4) append (blank seperated) e.p. info: - for "no e.p. possible"
>You can look up the details in the FEN standard, part of the PGN standard.
>Look at the line below, which I typed in, and see the diagram, provided not
>by me, but by the CCC web server, which recognizes the [D] and FEN after it,
>and inserts the graphics.  You can do that also.

Thanks! Will try to use it the next time.


>[D]knq3q1/rq1q1qbQ/Qq2Q3/1Qn1Q2B/Q1qN1Q1r/4K1B1/1q4QR/1N1q3Q w - -
>Chest says "no mate in 9" (216 seconds, K7/600 335MB hash).
>I will ask for more depth...

Are there no mistake? You have really 335Mb hash?

216 sec for 9 moves like very good. I went, by brute force, only up to 7 moves.
It was already 2 min. 19 sec. But for this position, which look very heavy,
branching factor was very normal. Like what you can expect from usual forced
mate position.

4 moves - 0.77 sec
               branching factor 5.8
5 moves - 4.39 sec
6 moves - 23.02 sec
7 moves - 2 min 19 sec


>>If you will solve, it will be nice if you will indicate your result.

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