When a pair has extraneous information about a board (e.g. by attempting to play it when they were not scheduled to do so, against a wrong pair), my normal response when they come to the board against the correct pair is to award AV+/AV- in favour of non-offenders.
The other day NS managed to "forget" they shouldn't be playing such a board against the proper opponents and tried to play it again. I cottoned on to this after the hand was finished and went to award AV+/AV-, but EW objected as they had obtained 100% on the board.
I allowed the result to stand under law 16D2(c).
I then wondered if I should always give the non-offending side an opportunity to earn greater then AV+ by allowing play of the board.
Is this right? It seems odd but fairer.
If it is right it opens up a raft of questions about how you prevent offenders from using UI, as there is probably upside but no downside to them doing so.