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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.
2 ♦ = Non-forcing, diamond length (typically 5+) with heart tolerance. Doubler can bid 2 ♥ with hearts as second suit and less than two diamonds. 2 ♥ = Natural, non-forcing 2 ♠ = Weak Raise 2NT = Invitational spade raise without a singleton side suit 3 ♣ / ♦ / ♥ = Invitational spade raise with singleton or void in bid suit 3 ♠ ...
The single or double raise promises at least five-card support for the minor. In the original version of K-S, and as further developed by Kaplan through the 1990s, both raises also deny a four-card major. This typical (but minimum) single raise in clubs is taken from the system book: [4] ♠ 765 ♥ K84 ♦ A5 ♣ Q9652.
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.
A raise of the bid suit extends the preempt, and is to play. The weak two bidder does not bid again. A bid of 2NT is 17+ artificial forcing enquiry. A new suit is forcing and at least invitational. This is known as RONF for raise only non-forcing bid. After a 2NT enquiry.
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A 2 ♣ response to a 1NT opening is specified as the "non-forcing" version of the Stayman convention. A 2 ♠ response to a 1NT is a relay to the minors when responder holds a long (at least six card length) minor suit and a weak hand; opener bids 3 ♣ and responder either passes or corrects to 3 ♦ which opener is expected to pass.