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1 ♠ – 2 ♣ 2 ♠ – 2NT. Forcing to game, with balanced hand and a good club suit. 1 ♠ – 2 ♣ 2 ♦ – 3 ♣ Forcing, unless the partnership has agreed that this is an exception to the "2/1 rule." 1 ♦ – 2 ♣ Forcing for one round only (as in Standard American), except in the variant of 2/1 where this sequence is game forcing as ...
A bidding system in contract bridge is the set of agreements and understandings assigned to calls and sequences of calls used by a partnership, and includes a full description of the meaning of each treatment and convention. The purpose of bidding is for each partnership to ascertain which contract, whether made or defeated and whether bid by ...
This is a list of bidding systems used in contract bridge. [1] [2] Systems listed have either had an historical impact on the development of bidding in the game or have been or are currently being used at the national or international levels of competition. Bidding systems are characterized as belonging to one of two broadly defined categories:
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. Typically, the bid is reserved for hands that are ...
Bridge base basic, also known as BBO basic, is a bidding system for the game of bridge based on the Standard American Yellow Card (SAYC). It is simplified, suitable for beginners, and widely used in internet bridge, particularly on Bridge Base Online . [ 1 ]
In the Vanderbilt Club system, an opening bid of 1 ♣ is artificial [Note 1] and forcing, and shows a good hand. A response of 1 ♦ is an artificial negative. Other bids are "regulation bids". [1]: 71–92 [Note 2] The system was published by Harold S. Vanderbilt in his 1929 book Contract Bridge. [1] It was the first strong club system.
As result, some hands with club suit are difficult to bid (e.g. both 1=3=4=5 and 2=2=2=7 hands have to be opened 1 ♦ with rebid in clubs). The Roman bidders used a negative double only up to 1 ♠ overcall over their 1 ♣ opening, and not elsewhere, making the balanced structure also vulnerable to interference.
For example, 5-3 and 4-4 are among the most common trump distributions on the declarer and dummy's hands. In cases, if an opponent shows out on the second trump round, then 5-3-1 or 4-4-1 is known, and the pattern 5-3-4-1 or 4-4-4-1 comes up automatically, and the other defender is known to have begun with four. Counting as a defender