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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 ...
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 ...
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
Contract bridge is a trick-taking card game played by four players in two competing partnerships in which a sequence of bidding, also known as the auction, precedes the play of the cards. The purpose of this bidding is for players to inform their partners of the content of their hand and to arrive at a suitable contract at which to play the ...
The name was chosen to express the idea that Byzantine Blackwood is a development from Roman Blackwood, by analogy with the Byzantine Empire and the Roman Empire; [3] rather than that the convention is of Byzantine [4] complexity. It seems to be little used nowadays (2014), most experts employing some form of Roman Key Card Blackwood.
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 ...
An opening bid of 2 ♦ shows one of two distributions: 4-4-4-1 or 5-4-4-0 (the five card suit is usually not a major suit) and 11-15 HCP The Mini-Roman 2 ♦ opening is a forcing bid. Responder has the following options. 2 ♥: Pass or correct and non-forcing; 2 ♠: Pass or correct to 3 ♣ and non-forcing; 2NT: Forcing, asking opener to bid ...
Brown sticker is a category of contract bridge conventional agreements defined by the World Bridge Federation (WBF). [1] Brown sticker conventions are considered to be difficult to defend against, and thus are permitted only at high levels of tournament play. Only highly unusual methods (HUMs) have a higher classification.