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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:
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 ...
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.
"Standard American" was the label given to the bridge bidding system developed by Charles Goren and his contemporaries in the 1940s. This system employed the 1915 point-count method to evaluate the strength of a bridge hand. Most bids had fairly specific requirements regarding hand strength and suit distribution.
The Imperspicuity losing trick count bridge bidding system uses the Law of Total Losers, shape asking relay bidding, loser asking relay bidding, CROSS and CRO relay bidding, and LTC techniques, to systemically determine the final bidding level, after opening bids and overcalls are initially made based on LTC evaluation methods. [4]
The method was devised by Jeff Rubens and published in The Bridge World. [1] Using Rubens advances, the available bids in the suits starting with the cue bid in opponent's suit up to and including the bid below a two-level support bid of the overcall are all transfer bids to the next suit. Furthermore, the available bids in the suits below the ...
Petkov has proposed a core bidding method, similar to the Precision Club derivatives Symmetric Relay and MOSCITO, that makes extensive use of limit bids, relays, and the shape defining properties of Zar Points to rapidly describe a hand. Below is a summary of the basics, omitting some of the finer points and the research details supporting the ...
Five-card majors is a contract bridge bidding treatment common to many modern bidding systems. Its basic tenet is that an opening bid of one-of-a-major in first and second position guarantees at least five cards in that major. This method has become standard in North American tournament play, but European methods vary. [1] [2]