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The 2NT response is forcing to at least game in opener's major suit. If the partnership also plays splinter bids, the Jacoby 2NT response tends to deny the shape for a splinter (i.e., no singleton or void). However, it might be the best alternative as prelude to possible slam exploration with unbalanced support in a holding stronger than the ...
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 ...
In response to a 2 ♣ opening, the 2 ♦ response is the "waiting" version of that response. In response to a weak-two opening, RONF ("Raise Only Non-Force") is used. 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.
The first drawback is that the weaker hand occasionally will end up declaring a contract with a trump fit in the major suit of the response. (Note that a transfer following opener's rebid of 2NT over a response of either 2 ♥ or 2 ♠ may be to the suit of the response. Such transfers cannot achieve the objective of making the strong hand the ...
Many partnerships which employ Bergen raises also use Jacoby 2NT and splinter bids in response to major suit openings for game-forcing hands with trump support. A direct raise to game is then preemptive on a very shapely hand (often with five card trump support).
If the 2NT bidder bids again freely, then it shows a strong two suiter. To distinguish the weak and strong holdings, many partnerships agree not to use the unusual notrump for intermediate hands (about 12 to 14 points); they would simply overcall with one of their suits and show the other later if the bidding offers a chance.
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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.