South discarded a diamond from dummy and topped the king with the ace. Declarer tested clubs by leading the ten to the ace and then advanced the deuce of hearts towards the closed hand. When East followed with the four, he put up the king and cashed out twelve tricks, N-S +690. North's cuebid was a slam try but South was having none of it since he had overbid by overcalling 2NT with only 14 HCP. He signed off at 3NT but North might have tried again by bidding a natural four clubs. South would boost to the minor suit game and North is liable to bid six clubs, reasoning that the minor suit game would yield a poor matchpoint result. His luck would be in because the ace of hearts is onside. A diamond slam declared by South is best. West will surely lead a spade and South will be able to discard a heart on the fifth club to bring home twelve tricks and the slam bonus.
West could be relatively certain that N-S could make a slam but declined to raise the pre-empt. In fact, East can scramble only six tricks in spades and, perhaps, West was wise to remain silent.