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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.
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.
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.
ask for the minor suit using a 2NT relay bid with a strong hand. The 2NT response is often defined as forcing to game, for example in Biedermeijer and AcolPlus. In particular, with a strong hand with a good suit of its own or with support for partner's opened suit, responder must bid 2NT first, as there is no other way to establish a force.
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
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 ...
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).
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.