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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.
2NT shows 3 controls (specifically 3 kings), and; 3 ♣ shows 4 controls, 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 ♥.
The right-hand opponent may ask the alerter about the meaning of the convention, or may proceed as usual. If the right-hand opponent does not ask about the convention, their partner may do so when it is their turn. Under ACBL and EBU rules, some conventions are also announced, for example Jacoby transfers. When a player makes a transfer bid ...
The Jacoby 2NT is used to show a game-forcing raise of a major suit with four-card support. Negative doubles are used through the level of 2 ♠. Fourth suit forcing is used. Michaels cuebid and Unusual notrump are used. Conventions are specified as being "off" in response to a 1NT overcall, except that 2 ♣ is still Stayman.
The Jacoby transfer, or simply transfers, in the card game contract bridge, is a convention in most bridge bidding systems initiated by responder following partner's notrump opening bid that forces opener to rebid in the suit ranked just above that bid by responder. For example, a response in diamonds forces a rebid in hearts and a response in ...
If the right hand opponent (RHO) of the partner of the 2NT bid passes, that partner is expected to bid the minor suit that he prefers at the three-level. 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.
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.
2NT is natural and invitational (showing about 18 HCP) three of a new suit (jump shift) is natural, normally agreed to be game-forcing, and shows about 19 points or more; When opener does not have a six-card original suit nor a four-card lower-ranking second suit, she will have to bid a short suit. Normally, she bids her three-card minor.