"Where has dummy's club gone?" asked declarer, and all was revealed.
It is now too late to change dummy's card. Declarer had a club as well as a heart: LHO had a heart but no club.
"You revoked," said LHO, "you did not play a club."
"Don't be ridiculous," said declarer, "I asked for a heart, I played a heart, that cannot be a revoke! Anyway, you had a heart, you ruffed, so you revoked."
"Bog off," said LHO, unpleasantly, "a club was played from dummy and I did not have any."
Did anyone revoke?

Merry Christmas and a Happy New Year to everyone, especially the ones with whom I have the least pleasant disagreements.
