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Even Roman Blackwood convention has several variations, revolving around 5 ♥ and 5 ♠ responses. In all variants, they denote 2 aces. One variation is that 5 ♠ shows extra values, while 5 ♥ does not. In other variations, responses 5 ♥ - 5NT denote specific combinations of aces (same color, same rank, or "mixed").
The Grand Slam Force is a bidding convention in contract bridge that was developed by Ely Culbertson in 1936. [1] It is intended to be used in cases where the combined hands of a partnership are so strong that a slam (winning at least 12 tricks) is a near-certainty and a grand slam (winning all 13 tricks) is a possibility.
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
3 ♦ or higher, etc. on up the line. With ace-showing responses, the responder bids the suit of the Ace, 2NT with two or more kings, and 2 ♦ with a king or less. With (unlikely) 2 aces, the responder bids 3 ♥. As a corollary, subsequent Blackwood by the opener asks for kings rather than aces.
Responses are given in the style of Roman Key Card Blackwood and may be based on a key-suit king instead of one of the aces normally shown. Key suits include: [5] the trump suit, any genuine side suit bid and supported, or; any suit bid by a player whose partner's first bid was in notrump.
Norman four notrump is an alternative to the Blackwood convention family. Used when the contract level can be better determined by knowing the numbers of aces and kings that are "missing" in the partnership's two hands, the convention is initiated by a bid of 4NT to ask that partner provide information about his ace and king holdings. The ...
Bidding 4 or 5 of the minor is preemptive and shows 6–9 points with 6-card support and at least 1 singleton or void in a side suit. When responder cannot support partner's bid, the response is 1 NT, to show a bad fit and no more than 9 points (i.e. denying ability to raise or bid a new suit).
[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 held by partner. A further relay bid may follow to inquire about the number of kings held. Gerber is used primarily after notrump openings, responses, and rebids, making it a complement to Blackwood rather than a replacement.