Author: Rafael Andrist
Date: 02:09:13 08/05/01
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On August 04, 2001 at 13:03:50, Bruce Moreland wrote: >On August 03, 2001 at 16:57:06, Miguel A. Ballicora wrote: > >>On August 03, 2001 at 15:44:09, Dieter Buerssner wrote: >> >>>A small question about chess rules. Assume the following position (which does >>>not make any other sense, than to show my point): >>> >>>[D] 3kr3/8/8/8/3p4/8/4P3/3RK3 w - - 0 1 >>> >>>1. e4 >>> >>>Now black cannot capture ep. Then just some stupid moves: >>> >>>1...Kd7 2. Ke2 Kd8 3. Ke1 >>> >>>Again the same postion as after 1. e4. >>> >>>3...Kd7 4. Ke2 Kd8 >>> >>>Can at this point White claim a draw, by saying "I intend to move Ke1 - 3fold >>>repetion"? >>> >>>I assume yes. If this is correct: Are you handling this correctly in your >>>chess-engine? >> >>Yes, it can be claimed draw because the 3 positions are identical. In neither of >>those dxe3 is possible. I do not remember the exact wording but the spirit of >>the rules were that the 3 positions should be "photographically" and >>"dynamically" identical. > >The other interesting case is castling. > >Let's say we are in a position where castling is "possible" for white, but not >legal now. The reason it isn't legal is that white is in check, and is forced >(in this case) to move his king. > >If this position appears again, the same exact moves are legal in both cases, >but when I asked this question in rec.games.chess.misc, people seemed to think >that this was a different position. > >The castling flags differentiate the position up until the piece is actually >moved. The position is checked for sameness right before the piece moves. > >I wonder if anyone at FIDE has thought this through? > >bruce > According to the FIDE rules, the positions are different. Rafael B. Andrist
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