East won the ace but shifted to a heart as partner scored the ace and attempted to cash the king of diamonds. South ruffed, drew trump and claimed eleven tricks, N-S +400.
East wisely switched to a heart at trick two since declarer was known to hold a singleton diamond. South would be able to score an overtrick if he had owned the ten of spades when he is tapped by a second diamond. All three of dummy's hearts would be parked on the spade winners.
East declined to open with a weak two diamonds as dealer. Perhaps E-W were playing Flannery or he rejected this action because he owned four hearts. He should open with a weak two-bid if that was their agreement as this call is an accurate description of his hand. What action would South take? A Top and Bottom Cue Bid revealing the black suits would hit the mark but NS were playing Michaels cue bids. South will overcall two spades but West will complicate matters by bidding three diamonds where North will be in a tough spot. A responsive double would promise heart length and could lead to trouble when partner rebids hearts. The club fit may remain buried when North opts for a spade raise.