THE PLAY.
Trick 1.
Tricks AB, 1
YZ, 0
1. A↷ Y B Z
5♦ 6♦ A♦ 2♦
Remark (Trick 1).—A has not both king and queen of diamonds, or he would have led one. B has not either king or queen of diamonds, or he would have played one of them instead of the ace. Therefore, Y must have one of those cards. Z draws this inference at the time. It will not be of any use to him until near the end of the hand.
Trick 2.
Tricks AB, 2
YZ, 0
2. A Y B↷ Z
5♣ 7♣ A♣ 4♣
Trick 3.