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The convention was first published in The Bridge World in January 1957. [7] Murray's presentation of the original convention included the following features: The Drury 2 ♣ is an artificial one-round force by a passed hand responding to partner's third or fourth-hand major suit opening bid
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.
2/1 game forcing (Two-over-one game forcing) is a bidding system in modern contract bridge structured around the following responses to a one-level opening bid: a non-jump response in a new suit at the one-level is constructive and forcing for one round, a non-jump response in a new suit at the two-level is forcing to game, and; a 1NT response ...
A bid that shows insufficient values for a stronger response. For example, a 2 ♦ response to a forcing 2 ♣ opening bid is often negative, as is a 1 ♦ response to a Precision 1 ♣. Negative slam double In a competitive auction, the double of a voluntarily bid slam to show no defensive tricks, and therefore to suggest a sacrifice. Neuberg ...
The Jacoby transfer, or simply transfers, in the card game contract bridge, is a convention in most bridge bidding systems initiated by responder following partner's notrump opening bid that forces opener to rebid in the suit ranked just above that bid by responder. For example, a response in diamonds forces a rebid in hearts and a response in ...
1NT is "to play", it discourages game and denies 4 spades if in response to 1 ♥. 2 ♣ is artificial and forcing; shows prospects for game; denies 4 spades if in response to 1 ♥. Direct raise of the suit is preemptive and sign-off. All other bids are "natural" and to play. Responses to 1NT 2 ♣ is a game-forcing relay asking for distribution
In standard forcing notrump, responder with five spades bids 1 ♠ over opener's 1 ♥ but if she also has 2 hearts she does not then know whether to rebid 2 ♥ or 2 ♠. In forcing next step, opener will raise 1 ♥ - 1NT to 2 ♠ if she has support, so if she makes another bid, responder can happily give preference to 2 ♥ .
Bridge bidding systems that incorporate a strong 2 clubs opening bid include modern Standard American, standard Acol, 2/1 game forcing and many others. In most natural bridge bidding systems, the opening bid of 2 ♣ is used exclusively for hands too strong for an opening bid at the one-level.