Double Finesse - Deal 8
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Bidding: : (W) 1♥ - (1♠) - 3♥ - 4NT - 5♥ - 6♥
Lead : K♠

Trick 1 North
K♠
 
Declarer (W)
A
A Q J 8 7 4
8 4 2
K Q 3
    ?   Dummy (E)
7 4
K 6 5 3 2
A J 9
A J 5
   
South
  Won = 0
Lost = 0

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Deep finesse.
Deep finesse in .
Declarer leads a small towards Dummy's ♦9, in the hope that North holds the ♦10. It is the only way he can make his contract.

Strategy rule
When only one card combination of the Opponents can win you the contract, play according to that card combination.
In this hand's case North must hold the 10♦ plus either the K♦ or Q♦. If this is the case Declarer can make his contract.