Opening lead: king of diamonds
Entry problems are common in many deals, and their proper management is often crucial to the success or failure of a contract.
Take this case where South is in five clubs. He takes the diamond lead with the ace and plays the king of clubs. West wins with the ace, cashes the queen of diamonds and continues with the jack.
South takes care to ruff with the eight of trumps, not the four, because his only certain entry to dummy is in clubs. He then cashes the queen of clubs and leads the four of clubs to the six.
Once South is in dummy, he must be very careful about what he does next. He must try to arrange successful finesses in both spades and hearts in the course of this one visit to dummy.
Obviously, he cannot take the heart finesse first, because he would wind up in the wrong hand even if the finesse succeeded. He therefore takes the spade finesse first.
But in so doing, he must be sure to lead the queen of spades from dummy, not the nine or ten. If East makes the best defensive play of ducking the queen, South plays his jack under it. South then continues with the ten, playing low if East plays low and leaving himself in position to take a heart finesse next.
Note that if East covers the queen or ten of spades when they are led, South is able to return to dummy with a spade to attempt the heart finesse. In effect, even though South has only one entry to dummy, he is able to arrange his play so that he can, if necessary, lead three times from there
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