Double Dummy Corner

 

Competition Problem 155a

composed by Leigh Matheson
presented for solving in February 2018

DR6

♠ AK5x

 98

 KQ3

♣ AKy2

♠ Q96

 K

 J109876

♣ QJ3

♠ 87

 106543

 A54

♣ 876

♠ J104x

 AQJ72

 2

♣ 109y

South is in six no-trumps. West leads the J.
The cards marked x are the ♠2 and ♠3; the cards marked y are the ♣4 and ♣5.
How must those four cards be placed to enable East-West to defeat the contract?
How is the contract made if those cards are placed differently?

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