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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 common ranges are 15-17 or 16-18 HCP ("strong notrump") and 12-14 ("weak notrump"). A bid of 2 ♣ typically shows a very strong hand (22+ points). A bid of 2NT shows a strong balanced hand, usually 20-21 HCP. Opening bids of 3 of any suit are preemptive, showing a 7+ card suit and 6-10 points (mostly inside the bid suit).
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.
Cue bids are used to communicate specific controls (aces or voids, kings and singletons). Once a trump suit has been agreed and the two hands are considered to be strong enough, partners bid the lowest available suit which they control; this process continues until one of the partners has sufficient information to make the contract decision.
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.
The next bid indicates suitability for slam: 3NT: strong (Serious 3NT) 4 ♣ /4 ♦ /4 ♥: cuebid, but not strong (non-serious). 4 ♠: truly minimum. Since Spades are the agreed trump suit, Three No Trump is not usually the best contract. Using Serious Three No Trump, a bid of Three No Trump says "I am Serious about slam", i.e. "I have a good ...
In contract bridge, an asking bid is a convention used to seek a slam accurately. There are two types - suit asking bids and notrump asking bids. Constructed by bridge pioneer Ely Culbertson in the 1940s, they have been superseded by other methods; however, one remaining commonly used asking bid is the 5NT Grand slam force.
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.