Three Bidding Systems Combined into OneFor the last six years, Richard Granville and David Burn have been developing MOSSO, a revolutionary bidding system derived from Two-over-One, Fantunes and Polish Club. MOSSO brings together the best features of its parent systems, while providing an effective interface between them. The system has been employed successfully by the authors and others in a number of tournaments, some at national level. This is the first volume of a two-book series and describes the full system in detail. The second volume provides supplementary information, including a large selection of example auctions and quizzes.