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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.
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.
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 ♥.
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.
Whether the partnership will play Jacoby transfers (bids of 2 ♦ and 2 ♥ over 1NT or 3 ♦ and 3 ♥ over 2NT respectively require the 1NT or 2NT bidder to rebid 2 ♥ and 2 ♠ or 3 ♥ and 3 ♠), minor suit transfers (bids of 2 ♠ and either 2NT or 3 ♣ over 1NT respectively require the 1NT bidder to bid 3 ♣ and 3 ♦) and Texas ...
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.
Oswald "Ozzie", "Jake" Jacoby (December 8, 1902 – June 27, 1984) [1] was an American contract bridge player and author, considered one of the greatest bridge players of all time and a key innovator in the game, having helped popularize widely used bidding moves such as Jacoby transfers.
2NT: Promises both minors. 3 of any suit: Natural. The convention has similarities to Multi-Landy. Abuses. Common abuses as described by Kit Woolsey include: