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  2. Strong club system - Wikipedia

    en.wikipedia.org/wiki/Strong_club_system

    The Strong Club System is a set of bidding conventions and agreements used in the game of contract bridge and is based upon an opening bid of 1 ♣ as being an artificial forcing bid promising a strong hand. [1] The strong 1 ♣ opening is assigned a minimum strength promising 16 or more high card points. All other bids would therefore be ...

  3. 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.

  4. Contract bridge probabilities - Wikipedia

    en.wikipedia.org/wiki/Contract_bridge_probabilities

    Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but (,,,) % and (,,,) % so now the club line is significantly better than the diamond line.

  5. Ogust convention - Wikipedia

    en.wikipedia.org/wiki/Ogust_convention

    Ogust is a bridge convention used by responder after his partner has made a weak-two opening bid; its purpose is to gauge the strength of the weak-two bidder's hand. Named after Harold A. Ogust from the United States, the convention is also known as the 'Blue Club response' from the bidding system developed by Benito Garozzo.

  6. Bidding system - Wikipedia

    en.wikipedia.org/wiki/Bidding_system

    The vocabulary of bidding is limited to 38 different calls - 35 level/denomination bids [1] plus pass, double and redouble. Any bid becomes a contract if followed by three successive passes, therefore every bridge bid is a potential contract. By the rules of the game, the agreed meanings of all calls must be public and known to the opponents ...

  7. Precision Club - Wikipedia

    en.wikipedia.org/wiki/Precision_Club

    Other popular Precision variations on opening bids are using a strong 1NT (14–16 is most common), using 2 ♣ to show only a 6+ club suit and expanding the possible hand patterns for the 2 ♦ bid to include the usual 4414 and 44–0–5 as well as 431–5 and 341–5,1 ♦ bid promises at least 2 diamonds.

  8. Bergen raises - Wikipedia

    en.wikipedia.org/wiki/Bergen_raises

    In contract bridge, Bergen raises are conventional treatments of responses to a major suit opening in a five-card major system. [1] Developed by Marty Bergen and first published in April 1982, [2] Bergen raises are based on the Law of total tricks, a hand evaluation concept which states that with a combined nine trumps in the partnership one should compete to at least the three-level ...

  9. Baron convention - Wikipedia

    en.wikipedia.org/wiki/Baron_convention

    The Baron Three Clubs is an alternative to the responder using Stayman over a 2NT opening bid. The responder will have five points or more and an unbalanced hand. The responder bids 3 ♣, which asks opener to bid his four-card suits in ascending order. If clubs are the only four-card suit, the opener bids 3NT.