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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 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 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.
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 ♥.
Here is a simple approach. Assuming the use of strong 1NT openings, the sequence 1 ♥ - 1 ♠ - 1NT would show a balanced 12-14 HCP with five hearts and 1 ♥ - 1 ♠ - 2NT would show 18-19 HCP with five hearts. Here is a more complex approach: Over a sequence of 1 ♠ - 1NT, opener rebids: 2 ♣ = 12-16, four clubs, or balanced.
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 ...
Jacoby won seven Spingolds, seven Vanderbilts, two Reisingers and more than a dozen other major titles. He was named to the ACBL Bridge Hall of Fame in 1965. He and son Jim are the co-authors of Jacoby Transfer Bids, Jacoby 2NT and other bidding ideas. Together, they won the Reisinger in 1955 --- when Jim was 22 --- and the Vanderbilt in 1965.
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.