The Duck - Deal 2
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Bidding: : (W) 2♠ - 4♠     Lead : K♣

Trick 4 North

 
Declarer (W)
♠ A K 8 6 4 3
♥ -
♦ 7 6 2

♣ 10 - -
?     2♠   Dummy (E)
♠ 7 -
♥ - Q 3
♦ A K Q J 4 3

♣ - -
    9♠
South
  Won = 1
Lost = 2

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This is the critical moment of the game.
Declarer must draw all Enemy trumps, so that he can run Dummy's winners.   Assuming the Enemy trumps are split 3-2, he will lose one trump trick.
But if they win when Dummy has no trumps left, the Opponents can cash an extra ♣ winner, defeating the contract.   So, what is the solution ??