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Subject: Re: Unusual Mate in 3 -> Hiarcs 10 have the same bug

Author: Andreas Guettinger

Date: 01:07:35 03/02/06

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On March 02, 2006 at 03:52:22, Vincent Lejeune wrote:

Maybe the interface is doing that because I couldn't verify these findings with
the Mac version of Hiarcs10:

+mate 3 62/1 00:00:00 4557 273420 1. Rg8 Rxg8 2. fxg8=Q Bxg8

regards
Andy



>
>H10 don't find the mate in 3 and when I play Rg8+ on the board H10 thinks it's
>draw
>
>Analysis by Hiarcs 10:
>...
>1...Txg8 2.Cxg8 Fxg8 3.f8D
>  =  (0.00)   Profondeur: 27/38   00:00:01  1281kN
>1...Txg8 2.Cxg8 Fxg8 3.f8D
>  =  (0.00)   Profondeur: 28/41   00:00:04  3325kN
>1...Txg8 2.Cxg8 Fxg8 3.f8D
>  =  (0.00)   Profondeur: 29/41   00:00:05  4098kN
>1...Txg8 2.Cxg8 Fxg8 3.f8D
>  =  (0.00)   Profondeur: 30/42   00:00:11  7980kN
>
>
>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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