I asked about pertinent laws. People (including me) started talking about Law 12 and the mechanics of score adjustment. But how do we get there?
I've looked again. Laws 65A, B, and C deal with how the cards of completed tricks are supposed to be place when the trick is quitted. These are "player does" laws, of which the Introduction to the Laws says "estabishes correct procedure without suggesting that a violation be penalized". Law 65D says
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A player should not disturb the order of his played cards until agreement has been reached on the number of tricks won.
The Introduction says, of what players "should" do, that failure to do it is an infraction which will jeopardize the player's rights, but will not often be penalized. Law 65D goes on to reiterate that violation may jeopardize rights. Law 66D says
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After play ceases, the played and unplayed cards may be inspected to settle a claim of a revoke or of the number of tricks won or lost, but no player should handle cards other than his own. If, after such a claim has been made, a player mixes his cards in such a manner that the director can no longer ascertain the facts, the director shall rule in favor of the other side.
The emphasis is mine. Law 79A says
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the number of tricks won shall be agreed upon before all four hands have been returned to the board.
Of "shall" the Introduction says
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a violation will incur a procedural penalty more often than not.
In the instant case,
both sides are guilty of the emphasized violation above (mixing their cards so the TD cannot determine the facts). So, per that part of Law 66D, the TD shall, for
each side in the dispute, rule in favor of the other. That is, for the declaring side, down 1, and for the defending side, contract making. A split score. Law 12 doesn't come into it we are following the instruction in Law 66D. Since Law 79A was also violated and since that Law uses "shall", I would issue a PP except to rank beginners. If this ruling is wrong in law, or for some other reason, please explain
why it's wrong.