Trick 2.

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

Trick 3.

Tricks AB, 2
YZ, 1
3. Y B Z A↷
5♦ 9♦ 2♦ Qn♦

Trick 4.

Tricks AB, 2
YZ, 2
4. Y B Z A↷
10♦ 4♣ 7♣ 4♦