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Subject: Re: How do you detect perpetual check?

Author: Robert Hyatt

Date: 17:40:03 10/23/98

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On October 23, 1998 at 00:45:33, James Robertson wrote:

>On October 22, 1998 at 23:14:56, Robert Hyatt wrote:
>
>>On October 22, 1998 at 21:45:54, jonathan Baxter wrote:
>>
>>>How do chess programs detect perpetual check? Do they just extend on sequences
>>>of checks or do they have specific features to detect likely perpetual
>>>situations?
>>>
>>>Jon
>>
>>
>>I don't do anything special other than checking for repetitions in the usual
>>way.  I extend on checks, and again if there is only one legal move to get
>>out of check.  Other than that, nothing special in my code at all...
>
>Wasn't Deep Blue unable to detect perpetual check in the second game of it's
>Kasparov return match? And Kasparov then made the foolish mistake of believing
>the computer wouldn't miss something like that?
>
>James


Kasparov didn't see it either.  It was a full 60 plies of search to see
the repetition...



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