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The forcing 1NT bid shows 6 to 12 HCP, denies the ability to make a single raise (but not necessarily an invitational raise), and denies holding four spades if the opening bid was 1 ♥; it must be announced as "forcing" by partner. As the forcing notrump creates problems of its own, a popular variation that overcomes these is the forcing next ...
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.
a non-jump response in a new suit at the two-level is forcing to game, and; a 1NT response to a major opening is forcing for one round and indicates insufficient values to immediately commit to game or bid a suit at the one-level. The 2/1 game force does not apply to responses by a passed hand, or if there is an intervening call by an opponent ...
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.
Another advantage is the relative precision with which strong balanced hands can be bid. An opening bid of 2 NT indicates a balanced hand with 20-21 HCP in Standard American or 20-22 HCP in standard Acol, and for even stronger balanced hands, the opening bid of 2 ♣ can be used. The opener's rebid (in these cases always in No Trump) then ...
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 ...
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.
Other popular Precision variations on opening bids are using a strong 1NT (14–16 is most common), using 2 ♣ to show only a 6+ club suit and expanding the possible hand patterns for the 2 ♦ bid to include the usual 4–4–1–4 and 4–4–0–5 as well as 4–3–1–5 and 3–4–1–5,1 ♦ bid promises at least 2 diamonds.