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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
Like SAYC, BBO basic depends upon hand evaluation using the high card point (HCP) method. Hand shape adjustments are made for long suits (1 point additional for every card longer than 4 in a suit), when bidding a new suit, and for short suits when showing support for partners bid (5 for a void, 3 for a singleton, and 1 for a doubleton). [2]
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.
[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.
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 ...
This is called a single-input-single-output (SISO) control system; MIMO (i.e., Multi-Input-Multi-Output) systems, with more than one input/output, are common. In such cases variables are represented through vectors instead of simple scalar values. For some distributed parameter systems the vectors may be infinite-dimensional (typically functions).
The choice of which version of a method to call may be based either on a single object, or on a combination of objects. The former is called single dispatch and is directly supported by common object-oriented languages such as Smalltalk, C++, Java, C#, Objective-C, Swift, JavaScript, and Python.