Vampyr, on 2012-October-17, 17:31, said:
In some cases it will not be a matter of UI. For every ten tables playing about 25 boards, there are, in my experience, about two infractions that infringe the basic mechanics of the games -- calls and leads out of turn, insufficient bids, revokes... and the vast majority of these are revokes.
I'l admit that it's years since I played or directed at the sort of club you're talking about, but these figures seem remarkably high. In nearly a year of directing the weekly duplicate at the 77 Club in North London, I didn't encounter a single established revoke (I know, because I remember discussing it with someone). OK, that was more than 20 years ago, but I doubt if the revoking patterns amongst social bridge players have changed very much since then.
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For established revokes there will be loads of possible outcomes, and the likely percentages of each may be very difficult to calculate.
I think that overstates the problem. In many cases a revoke makes no difference to the play, and a director can use results from other tables to find out what the normal results are. (I know this practice might be frowned upon in general, but we're talking specifically about directors who lack the ability, confidence or time to make their own judgement rulings, and a result concocted from looking at a traveller is likely to be much closer to equity than a result produced under the present rules.)
Maybe we need some data? Next time you're directing, why not keep track of the mechanical infractions you have to rule on, and then post the hands here?