Bridge Quiz 41 Answer
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All Vulnerable North
♠  J 9 8 6
♥  J 9 8 7 6 4 3
♦  2
♣  5
  Contract : 6♣
Declarer (W)
♠  K
♥  K
♦  A Q 10 7
♣  A K Q J 9 7 4
  Dummy (E)
♠  A 10 7 4 2
♥  Q 5
♦  J 8 6 4
♣  10 3
  ♠ Q 5 3
♥  A 10 2
♦  K 9 5 3
♣  8 6 2
South
   

On any other lead than the contract is 100% secure, provided

  1. Declarer immediately plays his K♠,
  2. then crosses over to Dummy via the 10♣,
  3. to lead Dummy's A♠ on which Declarer's K♥ can be discarded.
Now it does not matter if the finesse against the K♦ fails for the 6♣ contract is secure.