Trump Play - Deal 11
Deal 10 - Home - Deal 12
Trump suit is underlined
Bidding : 1♠ - (DBL) - 2♣ - 2♥ - (2♦) - 3♠ - 4♠     Lead : K♦

Trick 1 North
K♦
 
Declarer (W)
♠  K Q J 10 4
♥  A K 5 3
♦  7 5
♣  7 2
    Dummy (E)
♠  9 7 3
♥  J 4 2
♦  9
♣  A K 9 8 6 3
   

South
  Won = 0
Lost = 0

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Using Dummy's trump as entry
West switches to A♠ then 8♠ to reduce Dummy's trumps.
Declarer must not play his 4♠ on trick 2.   Declarer wins the 3rd trick in his hand, then plays three rounds of ♣, ruffing the 3rd ♣ with the Q♠
Declarer now leads his 4♠ to Dummy's 9♠ (the vital entry !) to draw the last remaining Enemy trump and run Dummy's remaining ♣ winners.