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Subject: Re: How many ways can a game terminate?

Author: Gerd Isenberg

Date: 16:24:01 07/23/04

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On July 23, 2004 at 17:31:10, Uri Blass wrote:

>On July 23, 2004 at 16:57:07, Steven Edwards wrote:
>
>>On July 22, 2004 at 17:58:45, Uri Blass wrote:
>>>On July 22, 2004 at 16:49:41, Steven Edwards wrote:
>>>
>>>
>>>I do not understand
>>>1)
>>>CTGameTermDrawFiftyMoveByBlack,
>>>CTGameTermDrawFiftyMoveByWhite
>>>
>>>Why seperate it.
>>
>>The 50 move draw claim is made by the last player to move; this stops the clock.
>
>It can be always made by the side to move and in computer chess immediatly
>before the move that it plays in case of 100 plies without conversion and no
>checkmate and immediatly after the move in case that the move that the program
>plays is the move that cause 100 plies with no conversion.
>
>The way that movei claims this draw is by printing the string
>Movei->draw by the fifty move rule 1/2-1/2 or something similiar(I am not sure
>if I remember now the exact string)
>
>Movei does not claim white or black.

Same for IsiChess. But after the Graz Shredder-Jonny game, wouldn't it be worth
to distinguish between the optional draw claim if a) the three-fold repetition
already occured (default) or b) the three-fold did not yet occur, but it may be
forced by an intended move, claiming the draw without playing that move over the
board.

Since draw by three-fold is still optional from both sides, it may even be worth
to notice the number of repetitions the draw finally was agreed.
Most probably less than 50 ;-)

Gerd

>
>Uri



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