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  2. Laws of Duplicate Bridge - Wikipedia

    en.wikipedia.org/wiki/Laws_of_Duplicate_Bridge

    The first Laws of Duplicate Contract Bridge were published in 1928. [1] They were revised in 1933, 1935, 1943, 1949, 1963, 1975, 1987, 1997, 2007 and 2017. [2] The Laws are effective worldwide for all duplicate bridge tournaments sponsored by WBF, zonal, national and subordinate organizations (which includes most bridge clubs).

  3. Bidding system - Wikipedia

    en.wikipedia.org/wiki/Bidding_system

    A bid of 1 ♥ or 1 ♠ shows at least 4 or 5 cards in the major suit, and 1 ♣ or 1 ♦ shows at least 3 or 4 cards in the minor suit. The complete hand usually contains about (11)12-20(22) high card points. As between two major suits or between two minor suits, the bidder opens in the longer suit; with equal lengths, the higher ranking suit ...

  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. Law of total tricks - Wikipedia

    en.wikipedia.org/wiki/Law_of_total_tricks

    If the N-S diamonds were divided 4-2 instead of 5-1, with clubs consequently divided 3-3, the available total tricks would be only 8 for N-S + 8 for E-W = 16 If, on the other hand, the E-W spades were divided 3-1 instead of 2-2 (with appropriate minor-suit rearrangement), they could make 2 ♥ , while N-S could still make 4 ♠ , giving 18 ...

  6. Gerber convention - Wikipedia

    en.wikipedia.org/wiki/Gerber_convention

    4 ♣ is Gerber if it is a jump bid or if a suit has been agreed as trump. 4 ♣ is Gerber if the immediate preceding bid by partner was in notrump. 4 ♣ is Gerber only if it is a jump bid over an opening bid or rebid of 1 NT or 2 NT. (Standard American Yellow Card) 4 ♣ is Gerber only when in response to opening bids of 1NT, 2NT or a strong ...

  7. Duplicate bridge movements - Wikipedia

    en.wikipedia.org/wiki/Duplicate_bridge_movements

    If r is the number of rounds and s is the number of rounds in which all tables arrow switch, the pairs who play as opponents in the rounds that are not arrow switched have a relative influence of (r-1) for the board group played head to head, -(r-1-2s) for board groups played in opposite direction at different tables, and 2s for rounds played ...

  8. Woolsey convention - Wikipedia

    en.wikipedia.org/wiki/Woolsey_convention

    3-1=4-5 distributional hands in the balancing seat regularly double, even with no 4-card major suit. Strong hands, with 19 high card points plus, start with a double and then rebid 2 Notrump (or double) to try to expose a psychic bid. Good 4-4=4-1 distributional hands with a stiff minor suit can start with 2 ♣.

  9. Blackwood convention - Wikipedia

    en.wikipedia.org/wiki/Blackwood_convention

    In the partnership card game contract bridge, the Blackwood convention is a bidding convention developed by Easley Blackwood in 1933 [1] and still widely used in the modern game. Its purpose is to enable the partnership to explore its possession of aces, kings and in some variants, the queen of trumps to judge whether a slam would be a feasible ...

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