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Subject: Re: Repitition detection

Author: Bruce Moreland

Date: 15:24:36 12/27/02

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On December 27, 2002 at 17:41:09, John Lowe wrote:

>I'm going to have to face this soon - I know it's not trivial and my conception,
>as usual, will be simplistic and naive.
>
>A repeat move becomes significant only when it is returned as the players move.
>If it leads to a draw it is in the interest af a side that is losing otherwise
>it is to be avoided. At some stage it must acquire a score of "0".
>
>Does the inclusion of the "repeat move" information in the search itself affect
>the move that will be made in avoiding the repetition? Or is the second best
>move found in the search (assuming not another repeat) either not adequate or
>uncertain?

If you don't handle repetitions, the humans won't figure this out for a while,
but once they do, watch out.

And before they figure it out and start exploiting it like crazy, you'll still
draw games where you are a rook up and winning effortlessly.

Having this stuff in the search allows for some pruning.  I don't know if the
amount is significant, but as a side-effect, I'll take it.  Detecting reps in
the search has to be significant tactically, since there are so many positions
where perpetual check is an issue.

I may not have answered your question.

bruce



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