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Several versions of Blackwood are available: Standard Blackwood, Roman Blackwood and Roman Key Card Blackwood (RKC or RKCB). All versions are initiated by a bid of four notrump (), and the entire family of conventions may be called Blackwood 4NT in both versions, or Key Card 4NT in the key card variation.
1430 or 1430 RKCB A mnemonic for a variant response structure to the Roman Key Card Blackwood convention. It represents "1 or 4" and "3 or 0", meaning that the lowest step response (5 ♣) to the 4NT key card asking bid shows responder has one or four keycards and the next step (5 ♦) shows three or zero. 1RF One round force. 2-under preempts
In a more modern form, known as Roman Key Card Blackwood (RKCB), the 4NT bid asks partner to disclose the number of key cards held where the five key cards are the four aces and the king of trumps. Responses are stepwise: 5 ♣ for 0 or 3 key cards, 5 ♦ for 1 or 4, 5 ♥ for 2 without the trump queen, 5 ♠ for 2 with the trump queen. Some ...
Perhaps the most widely known and used conventions are Blackwood, which asks for and gives information about the number of aces and kings held, Stayman convention, used to discover a 4-4 fit in a major suit following an opening no trump bid, Jacoby transfers, used to find a 5-3 fit in a major suit, and strong two clubs to show a very strong ...
Blackwood (either the original version or Roman Key Card) How the partnership's bidding practices will be varied if their opponents intervene or compete. Point count required for 1 NT opening bid ('mini' 10–12, 'weak' 12–14, 'strong' 15–17 or 16–18) Stayman (together with Blackwood, described as "the two most famous conventions in ...
When the Grand Slam Force was invented in the 1930s (when it was called "Josephine," named after Ely's then-wife Josephine Culbertson), Blackwood had not evolved into what has become the standard: Roman Keycard Blackwood (often called RKCB). Using KCB, there are 5 keycards -- the four aces and the king of trumps.
Having determined the degree of interest in exploring slam possibilities, the methods and conventions to determine which controls (aces, kings and even queens) are held by the partnership include: the Blackwood convention, the Norman four notrump convention, the Roman Key Card Blackwood convention and cuebids.
This is a list of bidding systems used in contract bridge. [1] [2] Systems listed have either had an historical impact on the development of bidding in the game or have been or are currently being used at the national or international levels of competition.