Trick 3.

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

Remark.—Z has called for trumps.

Trick 4.

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

Trick 5.

Tricks AB, 2
YZ, 3
5. Z A Y↷ B
8♠ Kg♣ 7♠ Kg♠