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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).
In contract bridge and particularly in duplicate bridge a convention card is a summary of the conventions and treatments that a particular pair is using. [1] The Laws of Duplicate Bridge specify that "Each partnership has a duty to make available its partnership understandings to opponents before commencing play against them."
It is also customary to retain the convention in the face of certain competitive actions, for example after a double by opener's LHO, or a negative double by partner. After an overcall by RHO, assuming that the bidding has not gone past 1NT, the convention is still on (for example after 1 ♦ - (pass) - 1 ♥ - (1 ♠) - X where X is a Support ...
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:
Australian Bridge magazine, December 2000, pages 20-21. List of defenses against a 1NT opening (text corrupted, but does provide a listing). Official website; Bridge Buff website: commentary on the MONK convention. Pattaya Bridge Club website: list of defenses against a 1NT opening are briefly reviewed, including a comparison of Cappelletti and ...
Rusinow leads is a bridge convention used as part of defensive carding.Rusinow leads are commonly used only on the opening lead against a suit contract; nevertheless, some experts use Rusinow leads only against notrump.
Lionel is a contract bridge bidding convention used in defense against an opposing 1NT openings. Using Lionel, over a 1NT opening of the opponents: a double is conventional and denotes spades and a lower suit (4-4 or longer),
Brozel is a contract bridge bidding convention used to intervene after an opposing one notrump (1NT) opening bid. It features the following calls: Double – shows any single suit; advancer bids 2 ♣, after which intervenor corrects to his actual suit (or passes with clubs). This was originally played as requiring either a solid suit or a very ...