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This is called playing _=down and out=_. Suppose third hand holds 7 and 2 only, and the lead is a King. The 7 is played. The leader goes on with the Ace, denying the Queen, and the third hand plays the deuce. If the Queen is not in the Dummy, the declarer must have it. In any case, the leader knows that if he goes on, his partner, the third hand, can trump that suit. With three cards, the lowest falling to the first round, followed by a higher card, will show the leader that the third hand still has another of that suit. It is not necessary to play down and out with an honour, because the leader can read the situation without it. Suppose third hand holds the J 5. He plays the 5 to the first round, because one of his two cards is an honour.