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Subject: Re: Programming Issue: When & how should the engine claim a draw or res

Author: Dieter Buerssner

Date: 14:34:13 11/30/03

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On November 30, 2003 at 17:20:14, Gerd Isenberg wrote:

>On November 30, 2003 at 16:37:17, Dieter Buerssner wrote:
>>http://www.fide.com/official/handbook.asp?level=EE101
>>
>>There I find:
>>---
>>9.2  The game is drawn, upon a correct claim by the player having the move, when
>>the same position, for at least the third time (not necessarily by sequential
>>repetition of moves)
>>
>>a) is about to appear, if he first writes his move on his scoresheet and
>>declares to the arbiter his intention to make this move, or
>>
>>b) has just appeared, and the player claiming the draw has the move.

Hi Gerd,

>Isn't b) redundant?
>
>I mean if you have already a 3-fold repetition where your opponont didn't claim
>a draw before, doesn't that imply that you can force another 3-fold repetition?

I agree, in a game theoretical sense, it should be redundant. However, it will
allow slightly different consequences. You don't have to write an additional
move on your score sheet. You can immediately stop the clock, instead of
remembering the move, that will yield in the next repetition. I did not look at
the rules while under time pressure anymore - perhaps it could make a difference
there, too. But, I agree with you, rule b) would not be needed. OTOH, for a
wb-engine running under WB, rule b is the only one, how it can behave correctly
for claiming the draw (because of deficiences in the WB-protocol).

Cheers,
Dieter



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