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Andrew’s favourite conventions (six)

In “Roman Key Card Blackwood” (RKCB) the 4 NT bid does not merely ask about the four aces, but also about the king of trumps (the “fifth ace”) and also the queen of trumps. The responses are: 5 ♣ shows 0 or 3 of the “five aces”; 5  shows 1 or 4 of the “five aces”; 5  shows two without the queen of trumps; 5 ♠ shows two with the queen of trumps. Over the 5 ♣ and 5  responses, the 4 NT bidder can ask for the queen of trumps by bidding the next suit up (not the trump suit); partner jumps to six of the trump suit with the queen and signs off in five of the trump suit without the queen.

North Deals
N-S Vul
A Q 7 6 4
K Q 4
7 5
A 7 5
9 8 5
10 8 7
9 6
Q J 10 9 8
N
W   E
S
K 10 3 2
J 9
A J 10 8
4 3 2
 
J
A 6 5 3 2
K Q 4 3 2
K 6
West North East South
  1 ♠ Pass 2 
Pass 4  Pass 4 N
Pass 5 ♣ Pass 5 
Pass 6  Pass Pass
Pass

South’s 2  response guaranteed five cards, so North correctly jumped to 4 . This excited an optimistic South into bidding RKCB. North’s 5 ♣ response showed 0 or 3 keycards (bound to be 3), South asked for  Q by bidding 5 , and West led  Q to the good 6  contract.

Declarer won ♣ A in dummy and led  5. East played low so  Q won. Declarer crossed to  Q and led  7 to East’s  A, East returning ♣ 4 to ♣ K. Declarer led  3 and trumped with dummy’s  4 after West discarded ♠ 5. Declarer cashed dummy’s  K, trumped ♣ 7, cashed  A, cashed  K and  4, and claimed.

ANDREW’S FAVOURITE CONVENTIONS: (6) Roman Key Card Blackwood

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