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Subject: Re: Unusual Mate in 3

Author: Robert Hyatt

Date: 08:32:26 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.


That is at least one bug I do not have. :)

                1     0.00   4.60   1. Rg7
                1->   0.00   4.60   1. Rg7
                2     0.00   4.24   1. Rg7 Be4
                2     0.00     +1   1. Rg8+!!
                2     0.00     +3   1. Rg8+!!
                2     0.00     +M   1. Rg8+!!
                2     0.00  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ Bxg8 3. Ng6#
                2->   0.00  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ Bxg8 3. Ng6#
                3     0.00  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ Bxg8 3. Ng6#
                3->   0.00  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ Bxg8 3. Ng6#
                4     0.05  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ <EGTB>
                4->   0.06  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ <EGTB>
                5     0.07  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ <EGTB>
                5->   0.08  Mat03   1. Rg8+ Rxg8 2. fxg8=Q+ <EGTB>
              time=0.08  mat=1  n=3803  fh=98%  nps=1.00M



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