Trick 3.

Tricks AB, 2
YZ, 1
3. Y↷ B Z A
5♥ Knv♥ 2♥ 7♥

Trick 4.

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

Remark.—B has led from a suit of at least five diamonds.

Trick 5.