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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.
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).
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 ...
In many bidding systems the following bid types are limit bids: (1) Natural notrump bids indicating balanced hands within a narrow high card strength range; (2) raises of partner's suit indicating a minimum number of cards in the raised suit, a narrow high card strength range, and likely ruffing values; or (3) rebids of one's own suit ...
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.
This is a list of defensive conventions used in the game of contract bridge to compete in the bidding after the opponents have opened with a one notrump (1NT) bid. ANTI Aspro [ 1 ] [ 2 ]
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.
New Minor Forcing (NMF), is a contract bridge bidding convention used to find a 5-3 or 4-4 major suit fit after a specific sequence of bids in which opener has rebid one notrump. The convention is triggered by responder at his second turn by an artificial bid of two in an unbid minor; it requires that he hold five cards in the major he has ...