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Subject: Re: Unusual Mate in 3

Author: Roman Hartmann

Date: 13:30:09 03/02/06

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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.

Sometimes it helps to have no 'clever' eval.

New game
1r5k/4NP1b/7K/8/6R1/8/8/8 w - - 0 1

Analysis by Roce 0.03453:

1.Ne7-g6+ Bh7xg6 2.Kh6xg6
    (1.17)   Depth: 2/5   00:00:00
1.Rg4-g8+ Rb8xg8 2.f7xg8Q+ Bh7xg8 3.Ne7-g6#
  +-  (#3)   Depth: 3/6   00:00:00
1.Rg4-g8+ Rb8xg8 2.f7xg8R+ Bh7xg8 3.Ne7-g6#
  +-  (#3)   Depth: 4/8   00:00:00
1.Rg4-g8+ Rb8xg8 2.f7xg8R+ Bh7xg8 3.Ne7-g6#
  +-  (#3)   Depth: 5/10   00:00:00

Roman





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