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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 ...
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.
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
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 ...
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Mini-Roman or Mini-Roman 2 Diamonds is contract bridge convention whereby the opening bid of 2 ♦ shows a three suited hand and 11-15 high card points (HCP). The convention is meant to help responder to judge, more quickly, the right level of the contract and the best trump suit (or if notrump would be better).
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