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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.
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.
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.
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 ...
Stayman is a bidding convention in the card game contract bridge.It is used by a partnership to find a 4-4 or 5-3 trump fit in a major suit after making a one notrump (1NT) opening bid and it has been adapted for use after a 2NT opening, a 1NT overcall, and many other natural notrump bids.
Several versions of Blackwood are available: Standard Blackwood, Roman Blackwood and Roman Key Card Blackwood (RKC or RKCB). All versions are initiated by a bid of four notrump (), and the entire family of conventions may be called Blackwood 4NT in both versions, or Key Card 4NT in the key card variation.
In natural bidding systems, balanced hands within specified high card point (HCP) ranges are generally opened with a notrump bid, or rebid in notrump. In the Netherlands, a bidding system called Saaie klaver ("Boring club") that reserves the 1 ♣ opening for all balanced hands (boring hands), has gained some popularity.
In the Swiss convention, in response to an opening 1 ♥ or 1 ♠, a bid of 4 ♣ or 4 ♦ shows four-card support for partner's suit, about 13–15 points, and two or three aces respectively. Alternatively, the bids of 4 ♣ and 4 ♦ can be used to show trump quality; the specific meaning of the two bids varies between partnerships.