TRICK 1.--Should Z refuse to win the first round of spades
with the king, his hand may be led through and the king captured. He
cannot gain by holding up this high card unless the original leader
holds a six-card spade suit as well as the ace of hearts. In other
words, he will lose if A has a four-or a five-card suit, and can
only win if A holds a six-card suit and the ace of hearts. In the
play of any hand, the usual, not the unusual distribution of the
cards should be considered.
TRICK 2.--Z must play the hand with a certain goal in
view--eight tricks. If he leads the diamonds, he is compelled to
guess, and a wrong guess would be disastrous. As the ace of hearts
must win, Z hopes, by allowing the spades to make, to obtain
information which will guide him to a successful finesse.
TRICKS 4, 5, AND 6.--Why does B protect both clubs and
diamonds?
TRICK 9.--A’s discard of the two of diamonds is informative
and as B is protecting the diamond suit the dealer can safely infer
the location of the queen.