The dealer should pass the first trick and not attempt the queen finesse until the second round. One trick, it is true, may be lost, but the play may win four tricks.
One or two leads of a suit may show a distribution of the cards which must give the adversary one trick. When this is the case, be careful to lose that trick while you have still another card of the suit to lead to the opposite hand.
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The dealer finds at the first lead that the second in hand adversary has no card of the suit. The jack is, therefore, three times protected in the opposite hand and the dealer should pass the first trick.
With nine cards of a suit in the combined hands headed by ace and king, all the remaining cards will probably fall on two leads, but when the suit is divided, six and three, with no card of re-entry in the long hand, it is safer to make sure of five tricks by passing the first round.
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Even when there is a re-entry card in the hand containing the long suit, if the adversaries must make a trick in the suit it is better play to lose the first trick. The re-entry may be an important card to retain.
When you hold a guarded honour in the suit led originally, or with a once-guarded king in an unopened suit, place the lead so that these honours will be lead up to. This can often be done by “ducking” or passing a trick.
“OVERTAKING AND UNBLOCKING”
The double necessity arises only on rare occasions. When the dummy contains no re-entry and the adversary opens a suit in which dummy has length, arrange the play of your own cards so as not to block the dummy’s suit.