Computer Chess Club Archives




Subject: Re: If you like to solve real mate...

Author: leonid

Date: 08:09:10 01/27/01

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On January 27, 2001 at 09:10:05, Tony Werten wrote:

>On January 27, 2001 at 08:53:07, leonid wrote:
>>If you like to solve forced mate position from real game, it is the one.
>>[D]7r/p4R2/1p4nk/3qP3/P1pr4/6PB/2Q4K/5R2 w - -
>>It is from game played in Hollannd in 1975 between Ernsteen and Berchem.
>XiniX solves this one in 1 sec  1. Qxg6+ Kxg6 2. Rf6+  , Kg5 3. Rf5+  , Kg6 4.
>Rf6+  , Kg7 5. Rg5+  , Kh7 6. Bf5+

If you can mention what is this program and on what computer you solved, it will
be appreciate.

Time is good.

>This way it is easy.
>The position in BT2630 is a couple of moves earlier. ( I never managed to solve
>this one )
>[D] 2b1q3/p7/1p1p2kb/nPpN3p/P1P1P2P/6P1/5R1K/5Q2 w - -

And in how many moves this position expected to be solved?

I tried it by selective search 13 moves deep but, after waiting around 6
minutes, disconnected. In 10 moves selective could find nothing. By brute force
even 5 moves lead me already to 5 minutes search. No mate existe in five.
Thought that maybe it is some 20 moves position that is, anyway, beyond my
actual program.

If somebody would like to solve average positions (not too easy but not too
complicated), below is one.

[D]qn1kbrqn/n1nqn1bp/bN1N1N1N/B1N1Nn1B/N1N1N1N1/8/1R1Q1R2/3K4 w - -

Mate existe for sure in 11 moves. Response was found by selective search and
minimal number of moves is unknown.


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