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  2. Bidding system - Wikipedia

    en.wikipedia.org/wiki/Bidding_system

    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 ...

  3. Quantitative notrump bids - Wikipedia

    en.wikipedia.org/wiki/Quantitative_notrump_bids

    If responder has 19 or 20 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made. 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)

  4. List of bidding systems - Wikipedia

    en.wikipedia.org/wiki/List_of_bidding_systems

    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:

  5. Bridge convention - Wikipedia

    en.wikipedia.org/wiki/Bridge_convention

    Bridge conventions can be classified according to their purpose: Opening bid conventions. Strong opening bids are used for hands stronger than the "normal" opening bid range (12-20 points in natural systems, 12-15/17 points in artificial systems) Strong two clubs in natural systems denote hands of 22+ high card points; Benjamin Twos in natural ...

  6. XYZ convention - Wikipedia

    en.wikipedia.org/wiki/XYZ_convention

    For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...

  7. Negative free bid - Wikipedia

    en.wikipedia.org/wiki/Negative_free_bid

    However, as a corollary, negative free bids affect the scope of negative double; if the hand is suitable for "standard" forcing free bid (10-11+ points), a negative double has to be made first and the suit bid only in the next round. Thus, the negative double can be made with the following types of hand: A weakish hand with unbid suits (unbid ...

  8. Hand evaluation - Wikipedia

    en.wikipedia.org/wiki/Hand_evaluation

    In contract bridge, various bidding systems have been devised to enable partners to describe their hands so that they may reach the optimum contract.Key to this process is that players evaluate and re-evaluate the trick-taking potential of their hands as the auction proceeds and additional information about partner's hand and the opponent's hands becomes available.

  9. Relay bid - Wikipedia

    en.wikipedia.org/wiki/Relay_bid

    In contract bridge, a relay bid is a conventional bid that usually has little or no descriptive meaning but asks partner to describe some feature of his hand. A relay is often the cheapest bid available but need not be. Stayman and Blackwood are common examples of relay bids. The rationale for introducing relay bids emerged from the idea that ...