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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:
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 ]
A mnemonic for the original (Roman) response structure to the Roman Key Card Blackwood convention. It represents "3 or 0" and "1 or 4", meaning that the lowest step response (5 ♣ ) to the 4NT key card asking bid shows responder has three or zero keycards and the next step (5 ♦ ) shows one or four.
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).
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.
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 ...
[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.
The single or double raise promises at least five-card support for the minor. In the original version of K-S, and as further developed by Kaplan through the 1990s, both raises also deny a four-card major. This typical (but minimum) single raise in clubs is taken from the system book: [4] ♠ 765 ♥ K84 ♦ A5 ♣ Q9652.