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A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 14 HCP (19 + 14 = 33 which is sufficient) pass with a minimum 12 HCP (20+ 12 = only 32) with partnership agreement, bid 5NT holding 13 HCP - asking partner to bid 6NT with 20 HCP and to pass holding 19 HCP. An opening bid of 2NT shows 20, 21 or 22 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. Another is the strong two bid, which is natural and shows a very strong hand (too strong for a 1 ...
The forcing notrump is a bidding convention in the card game of bridge.. In Standard American bidding, the response of 1NT to an opening bid of 1 ♥ or 1 ♠ shows 6 to 9 high card points (HCP) and is non-forcing.
To bid with the intention of causing the bidding to proceed to a particular level. For example: "In this auction, 2 ♣ forced to game", or "My reverse forced to the three-level." Forcing bid A bid that, by partnership understanding, requires the bidder's partner to make another bid. A forcing bid is not necessarily a strong bid.
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.
Stayman is a bidding convention in the card game contract bridge.It is used by a partnership to find a 4-4 or 5-3 trump fit in a major suit after making a one notrump (1NT) opening bid and it has been adapted for use after a 2NT opening, a 1NT overcall, and many other natural notrump bids.
The unusual notrump applies the principle that when the natural meaning of a bid is not generally very useful, it is profitable to agree that it means something somewhat opposite. That is, while natural notrump bids show a strong hand with balanced distribution, the unusual notrump shows a weak hand with very unbalanced distribution.
Such a bid shows most importantly the High Card Points range in Advancer's holding (which should be 13+ HCP — at weakest, Intervener has promised only 9 HCPs, and since bidding is now advancing to the 3-level, 13 HCP in advancer's hand guarantees a minimum joint holding of 22 HCP for the partnership).