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In the partnership card game contract bridge, the Blackwood convention is a bidding convention developed by Easley Blackwood in 1933 [1] and still widely used in the modern game. Its purpose is to enable the partnership to explore its possession of aces, kings and in some variants, the queen of trumps to judge whether a slam would be a feasible ...
Keycard Blackwood, or Key Card Blackwood (KCB) A variant of the Blackwood convention in which five keycards are counted, four aces plus the king of the apparent trump suit, rather than four aces alone. Commonly there is a follow-up to ask about the queen of trump ("Queen ask"), effectively the sixth keycard.
The Culbertson 4-5 notrump is a slam-seeking convention in the game of contract bridge. It was devised in the early 1930s by Ely Culbertson. Most four-notrump conventions (Blackwood and its variants being the best known) demand that bidder's partner define their hand using agreed codified responses. In contrast, the Culbertson 4-5 describes the ...
Well-known conventions include Stayman (to ask the opening 1NT bidder to show any four-card major suit), Jacoby transfers (a request by (usually) the weak hand for the partner to bid a particular suit first, and therefore to become the declarer), and the Blackwood convention (to ask for information on the number of aces and kings held, used in ...
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.
Gerber is a contract bridge convention devised by William Konigsberger and Win Nye from Switzerland [1] who published it in 1936; John Gerber of Texas introduced it to North America in 1938 where it was named after him. [2] [3] It is similar to Blackwood but uses 4 ♣ instead of 4NT as a relay (asking) bid to inquire about the number of aces ...
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Byzantine Blackwood is a bidding convention in the game of bridge. Devised by Jack Marx , it is a complex version of the Blackwood convention (by which a four notrump (4NT) call asks about partner 's honor card holdings). [ 1 ]