Author: Robert Hyatt
Date: 21:59:57 04/28/01
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On April 28, 2001 at 16:41:23, Peter Berger wrote: >On April 28, 2001 at 16:10:45, Robert Hyatt wrote: > >>On April 28, 2001 at 12:57:13, Peter Berger wrote: >> ><snip> >>>B.) Draw by repetition >>> ><snip> >>>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 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. >>> ><snip> >>>This is the correct way of doing it - no commercial chessprogram does it >>>properly ! >> >>I can't speak for commercial programs. Mine does it properly. It claims a >>draw if the position has already been repeated 3 times, else it makes its >>move and then claims the draw by repetition. >> >>I can't imagine any program _not_ doing this correctly. >> > >No, crafty _doesn't_ do it properly . Simply read what you have written and >compair it with the rule above . > >It is simply _wrong_ to make a move and then claim draw by repetition - that's >not what the rule says . > >There doesn't seem to be a perfect way of doing it for an XBoard/WinBoard engine >(probably the way Dieter Buerssner does it with Yace is a reasonable compromise >though : read http://www.icdchess.com/forums/1/message.shtml?166276 ) > >pete I disagree. Crafty can't "move pieces" on a real board. But in any case, I have never seen the rule state that you can _not_ make the move on the board. The rule simply has always been that you must claim the draw on _your_ time. Then the arbiter confirms the repetition. In the case of computers, that is obviously not necessary, but crafty says: "my move is 49. Rc8+ "The game is a draw by repetition" then it waits for whatever happens next... I don't see how a computer could do it any differently. I have seen that scenario played in major WC type events. I once watched Korchnoi do exactly that in a US Open game... He made the move on the board, wrote it down, claimed a draw, and got the arbiter...
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