Ten of hearts turned up.

THE PLAY.

Trick 1.

Tricks AB, 1
YZ, 0
1. Z A↷ Y B
4♦ 6♦ 3♦ Knv♦

Trick 2.

Tricks AB, 1
YZ, 1
2. Z A Y B↷
5♥ 7♦ 8♦ A♦

Trick 3.