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Subject: A test position for chess programs

Author: Uri Blass

Date: 09:00:41 12/29/00


This position is similiar to the position that crafty had no problem to solve

[D]R7/8/6k1/4n3/5p2/5P2/5r1p/7K b - - 0 1

The test is to avoid Nxf3 that is leading to a draw.
Another test is to see the draw after Nxf3.

I am interested to know if there is a program that can see the draw after Nxf3
by search.
I am not interested in the result of littlegoliath because I know that this
program can evaluate as draws positions that are not draws because it assumes
that there is a perpetual check if it cannot prove that there is no perpetual
check.



Did somebody try to do a program not for playing games but only to find if there
is a perpetual check?
The program can use selective search for white when it considers only checks for
white and replies for check for black.

It needs to evaluate only positions when white cannot do a check or positions
when there is a repetition.

It can evaluate repetitions as a draw and stalemates as a draw.

I believe that a program like this can prove that there is a perpetual check
because the number of relevant positions that it needs is small enough to search
to the end of the checks.

Did somebody try to build this program and how much time does it need to find
the pereptual check in the position after Nxf3?

Uri



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