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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.
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).
The weak two bid is a common treatment used in the game of contract bridge, where an opening bid of two diamonds, hearts or spades signifies a weak hand, typically containing a long suit. [1] It may be deployed within any system structure that offers a forcing artificial opening to handle hands of (eg) 20+ points, or an expectation of 8 or more ...
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) or 17-20 points (looking for slam in NT or a minor) An alternative method of minor suit transfers is to use 2 ♠ as a transfer to clubs and 3 ♣ (or 2NT) as a transfer to diamonds.
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).
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 ...
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.
Normally, a strong two bid is forcing for at least one round. Possible responses are: 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.