pran, on 2012-October-03, 14:58, said:
If instead West had just objected to the "lead" from Dummy with a statement like "it is my lead" then there would not have been any problem in correcting the incorrect play by Dummy in the last trick.
He does better by playing his other spade on declarer's call of the second top spade from dummy. Now both sides have contributed to the next trick, in a legal way, and he has condoned the lead out of turn, but gets to keep the spade trick he won. It is never wrong to take advantage of an opponent's irregularity, although I now see that mamos suggests it is sharp practice.
Interestingly, if he leads the ace of diamonds
after declarer called for the second top spade, then he has an unestablished revoke (because he has now condoned the lead out of turn) and a major penalty card, but gets to keep his previous trick! Although, according to pran's understanding, both sides have not yet played to the next trick.
I prefer to give the lawmakers credit for stating things for a reason - barmar