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Drury allows responding partner to learn if his opening partner has opened with a normal opening hand or has a light opening hand. If it is a light hand, or even a minimum normal opening hand, the contract can be set at the two-level, whereas non-Drury partnerships, with the same hands, would have to sign off at greater risk at the three-level.
The ACBL specifies announcements including "Transfer" for some transfer replies to notrump bids, the point range such as "15 to 17" for an opening bid of one notrump, and "Forcing" or "Semi-forcing" for a 1NT response to a major suit opening bid. Antipositional A call is antipositional if it tends to make the "wrong" partner the declarer.
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 ...
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.
Responder's only forcing bid is 2NT; all other bids are natural. The responses are: Pass, 2 ♥, 2 ♠, 3 ♣, 3 ♦ – to play; 3NT, 4 ♥, 4 ♠ – to play; 3 ♥, 3 ♠ – invitational; 2NT – forcing bid. The opener describes his hand more precisely: 3 ♣, 3 ♦ – 3 cards in the bid suit (i.e., 4=5=1=3 and 4=5=3=1 distribution ...
2/1 game forcing (Two-over-one game forcing) is a bidding system in modern contract bridge structured around the following responses to a one-level opening bid: a non-jump response in a new suit at the one-level is constructive and forcing for one round, a non-jump response in a new suit at the two-level is forcing to game, and; a 1NT response ...
A bid of 2NT shows a strong balanced hand, usually 20-21 HCP. Opening bids of 3 of any suit are preemptive, showing a 7+ card suit and 6-10 points (mostly inside the bid suit). The meaning of 2 ♦, 2 ♥ and 2 ♠ varies. One common usage is that the bid shows a weak two bid, similar to a preemptive bid.
Bridge bidding systems that incorporate a strong 2 clubs opening bid include modern Standard American, standard Acol, 2/1 game forcing and many others. In most natural bridge bidding systems, the opening bid of 2 ♣ is used exclusively for hands too strong for an opening bid at the one-level. Typically, the bid is reserved for hands that are ...