IMPs; Table Result 3NT-1.
There was a bit of a disagreement here at a local club last week, with SB, South on this hand, being "hoist with his owne petar" as the bard might have said. Before West could lead to 3NT, East was writing down the contract and exposed the ace of clubs when reaching for his pen. At least it could be seen by SB, who was quick to argue that it could have been seen by his partner, although the latter denied it. The TD came, ruled it was exposed, and SB decided to leave the ace of clubs as an MPC. West, familiar with the "Lille minute", led a low club, and the contract went one off on the obvious defence. In the other room the contract made when West led a top club and East played low, as it was far from obvious what West should do next. SB was not happy, especially when West goaded him by saying that he would have definitely made the contract if he had insisted on a club lead. The ace of clubs would be picked up, and West would have to lead a top club (as the fact that East had the ace of clubs would be unauthorised). Also West would be unable to continue with a small club for the same reason! How do you rule?