THE PLAY.

Trick 1.

Tricks AB, 0
YZ, 1
1. Y B Z A↷
5♠ 4♠ 2♠ 3♠

Remark.—B has no more spades.

Trick 2.

Tricks AB, 0
YZ, 2
2. Y↷ B Z A
Qn♣ 3♣ 5♣ 4♣

Trick 3.