After two trump winners, leaving West with the nine, he led the diamond jack.

West's trump winner had to be played on South's heart loser at the 13th trick.

South ruffed and put on some pressure by leading four trump winners.

West could take his trump winner whenever, but the contract was safe.

West won with the king, but did not know that his partner now had a trump winner.

He started with two trump winners, and East gave up his remaining diamond.

Again, the trump winner is the last trick for the defense.

This established the last heart in the dummy, and West could take his trump winner when he pleased.

Instead he took the side winners but then played two trump winners.

South won with the king and played two trump winners.