TRICK 1.--With three cards of re-entry in his hand A can afford to
lead one of them in order to gain information as to the position of
the cards in his long suit. Winning the first trick, A can clearly
see the situation. The play of the two of hearts by B indicates
that he cannot hold four cards in the heart suit. Should A continue
leading hearts he must establish one or more cards in the dealer’s
hand.
TRICK 3.--A cannot afford to lead spades, as Y holds a double major
tenace over his hand. As Z, the dealer, has passed the make, A can
mark strength in the diamond suit with B. He, therefore, abandons his
own suit and endeavours to help his partner by leading the singleton
diamond. B overtakes the jack of diamonds and continues with the suit.