SA-YC Simplified - This bidding system is a simplified version (as played on OKBridge) of the Standard Yellow Card (SA-YC) system of the ACBL (American Contract Bridge League). Its essential features include the strong no-trump, 5-card major and weak 2 openings.
Bidding Guide - Introduction to standard American bidding.
Bridge is it - Concerned with bridge bidding systems, especially CLONE, based on a forcing weak/strong 1 club opening. Also features links to other bridge resources, particularly on bidding systems. Bilingual site (English/Norwegian).
An Unassuming Club - A bidding system invented by Donald A. Varvel of Mountain View, CA, USA. It is based on an ambiguous 1 club opening, associated with 5-card majors, weak no trumps, and weak 2s.
Conventions - Survey of a large number of commonly used bridge bidding conventions and bidding systems.
The Blue Team Club System - Description of a complex bidding system invented in Italy. A major part of the information is in downloadable files only. Bilingual site (Italian/English).
The L System - An original bridge bidding system presented by Hong Liu, based on very light openings.
M.A.F. - The Ultimate Bridge Bidding System - A scientific bidding system from the Netherlands (5-card majors and different two-suiter openings). Bilingual site gives information in English and Dutch.
Precision Bidding System - Detailed description of the Precision Bidding System (strong 1 club opening, with 16+ points), as modified by one partnership.
Contract Bridge Culbertson System - Contract bridge bidding, as developed by Culbertson. Culbertson's survey of good playing techniques is also included.
Brazilian Bridge - Presentation of the Carioca Club and other conventions.
Bidding Quest - Practice bidding on prepared deals with scores. Compare and check how other pairs have bid same boards. Try bidding competition with anonymous partner.
The Diamond Major - Forcing club, 5-card major, medium notrump system.
Bridge Conventions - Provides an encyclopaedia of conventions, systems and treatments.
Neill, Daniel - Proposes bidding notes to download for many systems, conventions and treatments.
An Unassuming Club - Presentation of a variant of the Polish Club system.
Precision Two-over-One - Presents an overview of a system mixing a strong club with standard methods.
Bridge World Standard - Description of a bridge bidding system based on the preferences of leading players, and aimed at the needs of occasional partnerships. Some characteristics: 5-card major opening, strong no-trump, artificial strong two-club opening, weak 2s in the other suits, and inverted minors.
Bidding by Design - Proposes articles on bidding system theory and offers examples for download. Free system design software available for download.
B-M Precision - Detailed presentation of a variation of the system.
Aggressive Bidding Foundation - Proposes an approach based on a math model over computer analysis. Provides famous pairs systems, an exposition of the theory and a bidding machine.
Polish Standard 2000 - Description of the Polish Club bidding system, with different variants.
Bidding Order Shows Strength (BOSS) - Describes a system where priority is given to the strenght of the partnership hands.
REGRESsion - Modification of the bidding system Regres, based on frequent openings with weak hands and opening passes with strong hands.
The Chilli Bidding System - Gives priority to simplicity and universality of rules.
Pekiner, YAlçin - Proposes a collection of articles, tests and free software. English and Turkish.
Caliper - Bidding system from Norway based on a Big Diamond relay sequence.
Bridge Guys - Lists and defines a large number of systems and conventions.
Bridge Files - Provides overview of different systems, a list of conventions and information about the game. Free registration required.
Colonial Acol and LISA - Presentation of two bidding systems, one a US adaptation of the British Acol system, the other a modification of Standard American.
Coyot's 2/1 Game Force - Detailed presentation of this american system.
Inquiry 2/1 GF - Online book prensenting the author's variation of this popular north american system.
Zar Points - Aggressive hand evaluation and bidding based on distribution, controls, and hcp. Presents the Zar Bid Machine.
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