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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.
In contract bridge, Bergen raises are conventional treatments of responses to a major suit opening in a five-card major system. [1] Developed by Marty Bergen and first published in April 1982, [2] Bergen raises are based on the Law of total tricks, a hand evaluation concept which states that with a combined nine trumps in the partnership one should compete to at least the three-level ...
Perhaps the most widely known and used conventions are Blackwood, which asks for and gives information about the number of aces and kings held, Stayman convention, used to discover a 4-4 fit in a major suit following an opening no trump bid, Jacoby transfers, used to find a 5-3 fit in a major suit, and strong two clubs to show a very strong ...
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 ...
The convention concept is now generally extended to show the "two lowest unbid" suits. Thus, over 1 ♣, 2NT shows diamonds and hearts; and over 1 ♦, it shows clubs and hearts. In addition to succinctly describing the hand to the partner, it deprives the opponents of bidding space, i.e. it has a preemptive effect. A drawback is that it ...
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.
Well-known conventions include Stayman (to ask the opening 1NT bidder to show any four-card major suit), Jacoby transfers (a request by (usually) the weak hand for the partner to bid a particular suit first, and therefore to become the declarer), and the Blackwood convention (to ask for information on the number of aces and kings held, used in ...