West's three trump tricks were all that the defense could score.

Again, the defense would be limited to one trump trick in the East hand.

Two trump tricks and a heart were the limit for the defense.

The only chance is to promote a trump trick, so East must lead his last heart.

Whatever South did, the defense could score a trump trick.

Two trump tricks had to be lost, but that was all.

When hearts were continued South found he had lost control and could take only five trump tricks.

East's potential three trump tricks had turned into two, and the contract was made.

With the cards West held, he was certain to take a trump trick.

The defense took three trump tricks but that was all.