Double Dummy Corner

 

Competition Problem 127a

composed by Paolo Treossi
(presented for solving in September, 2015)

DR7

♠ Ax54

 32

 K102

♣ A10y3

♠ Kx

 KQ7654

 9

♣ K954

♠ J1096

 108

 QJ7654

♣ J

♠ Q32

 AJ9

 A83

♣ Q8y2

South is declarer in five no-trumps.  
The xís are the 7 and 8; the yís are the 6 and 7.

(a) Which of those cards must North hold to make the contract?
(b) How does the defence prevail if North lacks either of those cards?

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