Double Dummy Corner

 

Competition Problem 161a

composed by Paolo Treossi

DR6

♠ Kx2

 y5

 10543

♣ 9876

♠ Qx54

 AKy3

 K9

♣ QJ10

♠ 8

 J1092

 J876

♣ 5432

♠ AJ1093

 Q84

 AQ2

♣ AK

South is declarer in four spades.
The xís are the 6 and 7, the yís the 6 and 7.
Show why West must hold both sevens to defeat the contract.

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