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Problem: An Underground Track
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Your hand sitting South
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Bidding
Dealer North. Game all.
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Card play
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Lead: Jack of ♠.
Don’t be confused! After 4NT, Blackwood with clubs as trumps, 5♥ is asking about the trump Queen. This is not a conclusion. If South had chosen to play a ♥, he woud have bid 3♥ over 3♣.
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If East refuse to cash CQ , then club back to King and then Diam to 7 and Diam 10 , then D9 is good to run clubs.