Computer Chess Club Archives




Subject: Re: Unusual Mate in 3

Author: Thomas Mayer

Date: 04:29:46 03/02/06

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Hi Charles,

>  Came across this position by accident browsing chess club web sites.
>  It comes from the Duke University Chess Club. The position is
>  1r5k/4NP1b/7K/8/6R1/8/8/8 w - - 0 1
>  Telepath found the mate in 4 but could not find the mate in 3.
>  After some debugging I found out why!!!
>  Just before the final ply in the mate in 3, Telepath announced insufficent
>  material which is true. But in this position you can mate with insufficient
>  material.
>  It put such a smile on my face, I had to share it.
>  Maybe some of you have the same logic flaw in your code.

well, somehow. With TBs Quark finds the mate, of course, but when I play to the
position it says draw for Bxg8...  When I play instead of just analyzing it even
ends the game in WinBoard with claiming draw. I wonder how many more engines
have this problem as well... :) There are of course several other scenario
thinkable where this problem might arise, interesting and thanks for pointing
that out, even when it is not really strength related. Also it would be
interesting to see if some engines / GUI act here different when TB's are
enabled or disabled.

Greets, Thomas

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