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After a 1NT opening, a 2 ♠ response asks opener whether he is minimum or maximum for his bid. Opener responds 2NT with a minimum or at the three-level in his lowest four-card suit with a maximum. Responder may have one of two ranges: 11-12 points (looking for game in notrump) or 17-20 points (looking for slam in notrump or a minor suit).
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.
When an opponent opens the bidding with 1 ♥ or 1 ♠, the immediate overcall of 2NT shows at least 5–5 in the minor suits (that is, at least five clubs and at least five diamonds). 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.
With a spade stopper, bid 2NT first. With values for game and 0-3 hearts, bid 3NT. With a spade stopper, bid 2NT first. Example 2: There is space to bid a suit at the 2 level; e.g. after (2 ♥) – Dbl – (P) and the suit held is spades: With 0-7 points and 4+ spades bid 2 ♠; With 8-11 points and FOUR spade cards, 2NT is bid forcing a relay ...
A 2NT response is negative, showing a weak hand (six points or fewer in Standard American). All other responses are positive; in Acol these require 8 or more points or an Ace-King, i.e. 1½ quick tricks. Raise partner's suit with 3-card support. Bid a new suit with some values and 5+ cards in the new suit; Bid 3NT with good values and a ...
shows a single minor or both majors; advancer bids 2 ♣, after which the intervener corrects to his actual suit if a minor, or hearts if holding both majors 2 ♣ or 2 ♦: shows the bid suit and a major 2 ♥ or 2 ♠: shows the bid suit 2NT: shows the minors
Otherwise Advancer bids 2NT inviting Intervener to bid his minor as a last stop; before making the switch to the minor it is usually possible to deduce what that minor suit will likely be, since length in a suit in partner's hand is likely to reflect a suit shortage in your own hand. 2NT declares both minor suits (at least 5-4 or 4-5).
2NT with a weak hand (i.e. 12 HCP) - partner then chooses between passing or bidding a minor suit. 3 ♣ with a strong hand (14 HCP) - partner then chooses between 3NT, passing or bidding diamonds. 2 ♠ may also be used as a Baron range enquiry, to find whether opener is minimum or maximum, if responder has 11-12 points (looking for game in NT ...