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Re:Ideal Chess – drop chess perfected? by jmgao on Sunday December 20, 2020 @12:44AM (#25484155)
This seems like it'd degenerate into "pawn moves only", since you can immediately undo any other move.
Re:Ideal Chess – drop chess perfected? by breuleux on Sunday December 20, 2020 @01:02AM (#25484232)
Captures cannot be undone either, but yes, that might be a problem. Go solves it with the ko/superko rule that states it is illegal to move in such a way to reproduce a previous configuration of the board, and I think the same rule would be relevant here.

Edit: another simple solution (with interesting strategic implications) could be to forbid moving the same piece twice in a row.

Re:Ideal Chess – drop chess perfected? by mikk_w on Sunday December 20, 2020 @01:28AM (#25484347)
The best way to solve this is to say that you can't move a piece right back to where it just came from, like the ko rule in Go. As for superko, I think the threefold rule works just fine.