Solving this will further the cause of world peace...starting in my backyard.

I'm sure there are as many rules variations to this game as there are people playing it, but I can't find any resource that addresses the following scenario:

We play full credit (no canceling) to 21 exactly. If you go over, then your score reverts back to your score before that turn.

But then we have the "win by 2 or more" condition.

Player A was at 17, and scores 7 points to end the turn at 24.

Player B was at 15, and scores 6 points to end the turn at 21.

Who wins and why? There are a couple of different ways to interpret this, so I am not looking for a ruling as such. I'm looking for some consistent way to handle it.

quote:

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We play full credit (no canceling) to 21 exactly. If you go over, then your score reverts back to your score before that turn.

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Given the statement above you have 2 rules: 1. No cancelling 2. Your score starts over.

I would say that before Player B every took his turn the score of player A would be back at 17.

World Peace equals simplicity: Bring back cancelling and reset score on busts to 0,11, or 15.

I say stick to the ruling that over 21 means you revert back to your score before your turn. That would mean Player A would revert back to 17 points, and Player B would win with 21 points.

Now, if Player A went over and it resulted in them reverting back to a score that was within 2 points of 21, while Player B arrived at 21, then go another round. In this case, it no longer matters about playing to 21, they are just playing to win by 2.

I hope that made a little sense.

At least with other games, such as 301 (darts), we shoot to see who goes last. This means the best shot gets the last turn, trumping an exception as mentioned by the OP. Even if the situation went the way of Player A's 24 versus Player B's 21, player B would win by default since they arrived at their end score at the end of the round.
Conversely, if Player A arrives at 21 fair-n-square, the privelege is Player B's for a rebuttle. If B can't get 21 or goes over, A is the clear winner.