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Partner's responses to the 4NT ace-asking bid are made in step-wise fashion: 5 ♣ to indicate 0 or 4 aces; 5 ♦ to indicate 1 ace; 5 ♥ to indicate 2 aces; 5 ♠ to indicate 3 aces; When responding, do not count a void as an ace. Generally, 4NT is ace-asking when your side has bid a suit. There are exceptions:
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
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.
Sometimes, only two responses are possible A closed-ended question is any question for which a researcher provides research participants with options from which to choose a response. [ 1 ] Closed-ended questions are sometimes phrased as a statement that requires a response.
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.
The Norman scale, where an ace counts as one control and a king as half a control, is the basis of the following responses to the 4NT asking bid: 5 ♣: 0 to 1 controls indicating either (a) no aces or kings, or (b) one or two [citation needed] kings or (c) one ace 5 ♦: 1½ controls indicating either (a) one ace and one king or (b) three kings
[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.
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).