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A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 14 HCP (19 + 14 = 33 which is sufficient) pass with a minimum 12 HCP (20+ 12 = only 32) with partnership agreement, bid 5NT holding 13 HCP - asking partner to bid 6NT with 20 HCP and to pass holding 19 HCP. An opening bid of 2NT shows 20, 21 or 22 HCP.
The unusual notrump applies the principle that when the natural meaning of a bid is not generally very useful, it is profitable to agree that it means something somewhat opposite. That is, while natural notrump bids show a strong hand with balanced distribution, the unusual notrump shows a weak hand with very unbalanced distribution.
Notrump, or no trump (NT) A contract, or a bid that names a contract without a trump suit. Notrump is the highest-ranking strain. WikiProject Contract bridge deprecates the two-word "no trump", however "no trump" is the usual spelling in the United Kingdom and in those European countries which have adopted this English term.
A bid in partner's suit or a new nonadverse suit is competitive without showing game interest. A cuebid of the opponents’ known suit shows a raise of partner's suit. The raise is invitational limit raise or stronger. The cue bid raise implies a five-card side suit (probably, not the overcaller's unspecified second suit).
In contract bridge, an asking bid is a convention used to seek a slam accurately. There are two types - suit asking bids and notrump asking bids. Constructed by bridge pioneer Ely Culbertson in the 1940s, they have been superseded by other methods; however, one remaining commonly used asking bid is the 5NT Grand slam force.
The dynamic one notrump opening indicates either: a balanced or unbalanced hands in the range of 19-21 high card points (HCP) and six controls, or; an unbalanced hand just short of a 2 ♣ opening. The most common responses to the dynamic one notrump opening are: 2 ♣ – negative (0-5 HCP) 2 ♦ – 6+ HCP, game force.
In the card game contract bridge, DONT is a conventional overcall used to interfere with an opponent's one notrump (1NT) opening bid. DONT, an acronym for Disturb Opponents' Notrump, was designed by Marty Bergen, and is therefore also referred to as "Bergen over Notrump". Although the method is often criticized for being too nebulous, it ...
The forcing 1NT bid shows 6 to 12 HCP, denies the ability to make a single raise (but not necessarily an invitational raise), and denies holding four spades if the opening bid was 1 ♥; it must be announced as "forcing" by partner. As the forcing notrump creates problems of its own, a popular variation that overcomes these is the forcing next ...