TRICK 1.--B’s play of the jack denies the ace, which must be with the
dealer.
TRICK 2.--Should A allow the queen of hearts to win this trick, his
re-entry card would be taken out before his suit is cleared. He must
overtake his partner’s card in order to establish the suit.
TRICK 4.--The dealer hopes that the ace of clubs is with B, as this
would shut out A’s heart suit.