In no-trumps, lead the bottom card.
|A 5 2||K J 10 7 3|
|Q 9 8|
West leads the 2, East takes the king and returns the jack. South scores no tricks. However, if West leads the ace first, South makes a trick with the queen.
|A 6 4||Q J 10 9 5|
|K 8 2|
West leads the 4, East plays the 9 and South takes the king (If South ducks, South makes no trick.) Now if either East or West gain the lead the defence can take four tricks. However, if West leads the ace first, South can hold up the king till the third round Now West cannot return East's suit later.
In a trump contract, the danger of a singleton makes it superior to lead the ace first.
|A 6 4||Q J 10 9 5 3|
|K 8 2|
In a suit contract, West leads the ace. The defence takes one trick and so does declarer. If West leads low, declarer takes a trick but the defence has none.
|A 5 4||K 10 9 8 3 2|
|Q J 7|
In a suit contract, West leads the ace. The defence takes a trick and declarer cannot score a trick without conceding a trick to East. If West leads low to the king, declarer can later lead the queen and score a trick without losing a second trick.
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