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3-D chess

The third dimension isn't the one you're thinking of
 
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The rules of this game of chess, played on a standard board, call for a theoretically infinite number of other boards reflecting all past and future positions from the present game. A single additional rule is in effect: Each player is allowed, as his turn, to swap a square in the game with that square as it was at a previous OR LATER point in time.

If taken from a previous point in time the game reverts to that point but with that square replaced with the new one, and that many moves ahead that square changes again to reflect the change. For example I move my queen's pawn forward for my first move, my queen forward one for my second move, and my queen back for my third move. On the fourth move it would be legal to put my queen in play from my third move on that square. At that point the game would revert to the game at move three when the queen was there, but without my queen. I would have my move and the next turn I would have two queens, just for that turn. The next turn my queen from the original position would disappear.

The same would happen if I choose to swap a square from later in the game: the game would revert upon that turn being reached, with the square swapped.

EDIT: If the later board position is occupied the time travel can't be done and the extra piece is forfeited.

Voice, Sep 19 2013

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       "Now, before I begin the lesson, will those of you who are playing in the match this afternoon move your clothes down onto the lower peg immediately after lunch, before you write your letter home, if you're not getting your hair cut, unless you've got a younger brother who is going out this weekend as the guest of another boy, in which case, collect his note before lunch, put it in your letter after you've had your hair cut, and make sure he moves your clothes down onto the lower peg for you..."
MaxwellBuchanan, Sep 19 2013
  

       Time as the third dimension...wait, didn't we just have this argument?
Alterother, Sep 19 2013
  

       Yes, we didn't.
rcarty, Sep 19 2013
  
      
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