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On the bidding, West has five spades; from the opening lead
East can be placed with the doubleton KQ, so the suit is
blocked if South takes the first trick with the ace. West's
entry -- the ace of diamonds -- must be knocked out before
the spades can be unblocked, therefore at trick two South must
lead the K. If West ducks,
South continues diamonds. Declarer now cannnot be prevented
from scoring three hearts, a spade, two diamonds, and three
clubs. Declarer can lead clubs from dummy twice, using
hearts as entries; East will have to lead diamonds at the
end after taking the Q.
For example, the play might go: A, K taken by the A,
spade to the Q, heart to the K, finesse the 10, heart to
the Q, finesse the club Q, A, A, low to the J; East
can take the fourth heart but must lead diamonds at the
finish. (If East cashes the Q at trick four, declarer has
the two needed diamond tricks, plus two heart entries to
finesse in clubs.)
If declarer wastes an entry to dummy at trick two to lead
diamonds, there won't be enough entries to get five minor
suit winners. For example, West can take the 10 with the A,
play a spade to East, who can exit with a heart. Say declarer
wins in dummy, finesses clubs, cashes the A, and plays a low
diamond to the J. East wins the Q, cashes the fourth heart,
and exits in clubs. Declarer can take two more clubs, but must
lost a diamond at the end.
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