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Jacoby 2NT (Swedish: Stenberg 2NT) is a bridge convention in which a bid of 2NT over partner's opening bid of one heart (1 ♥) or one spade (1 ♠) shows a hand with both opening strength or better - normally at least 12 HCP or a hand meeting the "Rule of 20" criteria, and; at least four-card support for opener's major suit.
An opening bid of 2NT shows 20, 21 or 22 HCP. If responder has 13 HCP, then a small slam looks certain (13 + 20 opener's minimum = 33) and should be bid; If responder has 11 or 12 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made.
Bridge conventions can be classified according to their purpose: Opening bid conventions. Strong opening bids are used for hands stronger than the "normal" opening bid range (12-20 points in natural systems, 12-15/17 points in artificial systems) Strong two clubs in natural systems denote hands of 22+ high card points; Benjamin Twos in natural ...
Finally, 2NT or a raise of the opening bid shows 14 to 17 high card points, and is invitational to game; a raise shows three card support or better, and 2NT denies three card support. (If responder has an invitational hand without support, but cannot abide opener's possible pass of 2NT, he must guess whether to bid game or not.)
For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...
2NT: 11–13 or 16+, balanced; 3 ♣, 3 ♦, 3 ♥, 3 ♠: 4–7, 7-card suit; 3NT: 14–15, balanced; 1 ♦: 11–15, no 5 card major or 6 card club suit. Originally 4+ suit and unbalanced hand. A notrump range is included in some versions, 2+ suit in this case. In some versions, where classic precision 2 ♦ opening is not played diamonds can ...
Muiderberg is a bidding convention in the card game bridge. It is a two-level preemptive opening based on a two-suiter with precisely a five-card major and a minor suit (four-card or longer). In Muiderberg the 2 ♥ opening denotes five hearts and an unknown minor suit, whilst 2 ♠ denotes five spades and an unknown minor suit. The convention ...
This avoids need for puppet Stayman, greatly streamlining assessment of slam prospects over a simplified 2NT opening. While technically a " brown sticker " convention because Multi has no known "anchor suit", its popularity, and availability of published defenses, have persuaded the World Bridge Federation to allow its use even in lower ...