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The forcing notrump is used over major suits only; 1NT is always standard and non-forcing over the minor suits. 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.
An agreement that treats the single raise of a minor suit as strong, and a double raise as preemptive. Invitation A bid which invites the partner to bid on to game or slam if he has extra values. It is a non-forcing bid by definition. Compare semi-forcing bid. IPBM International Popular Bridge Monthly, a British bridge magazine.
Limit Raises: A jump-raise of the opener's suit by responder, in the absence of opponent interference, is invitational to game. In Goren's system, this was a strong game-forcing raise. Notrump openers show a balanced hand, with the following common high card point (HCP) ranges: 1NT = 15-17 HCP; 2NT = 20-21 HCP; 3NT = 25-27 HCP
A jump shift in the other minor 1 ♣ - 2 ♦ or 1 ♦ - 3 ♣ shows a limit raise (9-12 HCP) and at least 4 card support; A simple raise of a minor is therefore game forcing; A jump raise in the minor shows 5+ card support and less than 9HCP; Some players prefer to show aspects of opener's hand other than stops, when bidding a new suit [7]
Transfers are not used, and Stayman is non-forcing. Kaplan's highly successful partnership with Norman Kay used "Timid K-S," which departed from the original K-S structure by using a strong no trump when vulnerable. Five-card majors, with limit raises. A 1NT response is forcing and responder's double is negative. 3NT is the strong, forcing raise.
In these systems, such as Acol and Standard American, NT bids are limit bids and therefore are not forcing. Bearing in mind the need to bid only to the optimum contract and no higher, bids above game are made only in specific circumstances, one of which is to alert partner to the fact that a slam may be possible and inviting partner to take ...
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good raise in hearts (8 losers or better) 3 ♦: sound values in spades at the three level or better 3 ♥: weak raise in hearts but stretched (8½ to 9 losers) 3 ♠: six spades, not forcing 3NT: to play 4 ♣: splinter (singleton or void in clubs) in support of hearts 4 ♦: splinter (singleton or void in diamonds) in support of hearts 1 ♠ ...