What you're describing is just a superset of a vague rule. It's a vague ruleset. If we sit down together and you think we're playing draughts and I think we're playing checkers, then we might fail to negotiate the rules ahead of time, with the vague rule being "the standard rules of the only game you can play with these pieces". We are eventually going to figure that out when someone makes an "illegal" move in the other game. That's not cheating, it's crappy negotiation, and the way to handle it is covered in my second paragraph.
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Date: 2014-04-06 07:02 pm (UTC)