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Subject: Re: Analysing while retracting moves

Author: Robert Hyatt

Date: 19:58:13 11/26/01

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On November 26, 2001 at 19:34:48, Tom Kerrigan wrote:

>On November 26, 2001 at 15:12:59, Robert Hyatt wrote:
>
>>If it were one move, you would be right.  But it typically isn't.  It is
>>_many_ moves.  Say 10 moves or 20 plies.  And the score doesn't get backed up
>>the the _real_ problem move at all...
>
>Ah, here's where we fundamentally disagree. Do you have any evidence that
>"typically" mistakes can only be found with 20+ plies of search? 20 sounds to me
>like a number that was pulled from somewhere unpleasant.
>
>-Tom


Try some games.  Like the famous Shirov sacrifice, and see where the program
thinks white goes wrong.  Those are the kinds of positions that are important
to the discussion.  If the problem is only detected one move late, that can
be fixed by 10x more search time.  It is the ones that are much deeper that
cause the problems...



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