Bidding: : (W) 1NT - 3NT     Lead : 7♥

Trick 1		North 7♥
Declarer (W) ♠ A J 3 ♥ - J 2 ♦ A Q 4 ♣ K 7 6 3	K♥		3♥	Dummy (E) ♠ Q 2 ♥ 6 4 - ♦ K 7 2 ♣ A J 10 9 2
		Q♥ South		Won = 1 Lost = 0

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South now is the "Danger man" and must not gain the lead.
If North gains the lead, Declarer's J♥ will always make a trick.