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Subject: Re: Apparently Crafty has some bugs with threefold repetition (n.t.)

Author: Frank Phillips

Date: 10:52:45 07/04/04

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On July 04, 2004 at 12:54:51, Sandro Necchi wrote:

>Crafty has some bugs?
>
>?????????
>
>He said that it was better to have a bug free program...or do I remember wrong?
>
>Sandro

I doubt that Bob has changed his mind, although he will speak for himself of
course.

What is the nature (manifestation) of Crafty's bug.  From the score-sheet it
would appear that Shredder claimed the draw on its intention to play (Kc7).



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)

   1.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
   2.has just appeared, and the player claiming the draw has the move.

Positions as in (a) and (b) are considered the same, if the same player has the
move, pieces of the same kind and colour occupy the same squares, and the
possible moves of all the pieces of both players are the same.
Positions are not the same if a pawn that could have been captured en passant
can no longer be captured or if the right to castle has been changed temporarily
or permanently.
9.3  The game is drawn, upon a correct claim by the player having the move, if

   1.he writes on his scoresheet, and declares to the arbiter his intention to
make a move which shall result in the last 50 moves having been made by each
player without the movement of any pawn and without the capture of any piece, or
   2.the last 50 consecutive moves have been made by each player without the
movement of any pawn and without the capture of any piece.



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