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Subject: Re: Draw by 2nd repetition?

Author: Jeremiah Penery

Date: 09:46:42 03/31/99

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On March 31, 1999 at 12:08:49, James Robertson wrote:

>I have noticed from a post below that some people consider the position a draw
>if it has repeated twice in the search. What are the advantages and
>disadvantages of this? I am currently waiting until 3rd repetition; is this
>worse?
>
>Thanks,
>James

From what I've seen, it's good to wait until the 3rd repetition.  Very often,
I've seen times when Crafty (which scores a draw at 2nd repetition) finds that
it can force the position to repeat (for the second time) and so scores it as a
draw, even when the opponent has any number of winning moves it can play before
the third repetition.  It often plays inferior moves thinking it can draw by
repetition.
I'm not sure where it could be better to detect draws after the second
repetition - it seems it'd be just as easy, and more reliable, to detect them
only at the third rep.

Jeremiah



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