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Subject: Re: Unusual Mate in 3

Author: Alessandro Scotti

Date: 09:38:05 03/02/06

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Hi Charles,
very nice position, thanks for sharing!

My new engine fell for it, while Kiwi easily announced the correct mate.
The difference between the two is that Kiwi requires only ONE minor piece on the
board to give insufficient material, while the new engine allowed two, one for
each side. Since now you have remembered me why I did so in Kiwi, I have fixed
the condition in the new engine! :-)
Later, I'll probably try to add some "smarter" bit that allows me to use the one
piece per side condition...


On March 02, 2006 at 00:26:08, Charles Roberson wrote:

>
>  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.



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