TRICK 1.--It would be bad play to hold up the ace of hearts.
The adversary can only make the queen and jack, the nine being three
times guarded in Z’s hand. The spade suit must be established at once.
TRICK 5.--As A holds a possible card of re-entry in diamonds, he
continues his own suit.
TRICKS 7 AND 8.--Clever play to unblock the club suit and to obtain
the lead with the eight of spades. Z discards his losing diamonds.