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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.
The Culbertson 4-5 notrump is a slam-seeking convention in the game of contract bridge. It was devised in the early 1930s by Ely Culbertson . Most four-notrump conventions ( Blackwood and its variants being the best known) demand that bidder's partner define their hand using agreed codified responses.
Strong notrump after passing (SNAP) is a bridge bidding convention originated by Jeremy Flint and Tony Priday [1] [2] and is a one notrump (1NT) bid by a passed hand in response to a one-level opening by his partner.
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.
Strong hands, with 19 high card points plus, start with a double and then rebid 2 Notrump (or double) to try to expose a psychic bid. Good 4-4=4-1 distributional hands with a stiff minor suit can start with 2 ♣. Single-suited minor hands often start with double, hoping to be able to play at the two-level. These hands will pass a 2 ♦ asking bid.
After a 1NT opening, a 2 ♠ response asks opener whether he is minimum or maximum for his bid. Opener responds 2NT with a minimum or at the three-level in his lowest four-card suit with a maximum. Responder may have one of two ranges: 11-12 points (looking for game in notrump) or 17-20 points (looking for slam in notrump or a minor suit).
Norman four notrump is an alternative to the Blackwood convention family. Used when the contract level can be better determined by knowing the numbers of aces and kings that are "missing" in the partnership's two hands, the convention is initiated by a bid of 4NT to ask that partner provide information about his ace and king holdings. The ...
2 ♣ declares a one-suited hand - usually 6 or more cards, but some bid with a strong 5-card suit. Partner (known as 'Advancer') is expected to respond as follows: usually, Advancer makes an artificial 'relay' bid of 2 ♦, asking Intervener to pass if his suit is diamonds and otherwise to bid his long suit at the lowest level.