Roy Hughes Bridge Books

Roy Hughes is a Canadian bridge expert who has played in a number of World Championships. His background in mathematics and linguistica has led him to think a great deal about the theory and structure of effective bidding systems.
I found the book "Building A Bidding System" absolutely fascinating, but it really is for the advanced/expert player. Roy discusses the theory of bridge bidding for advanced players, with the emphasis on the principles behind an effective bidding system. These include the concepts of Useful Space, Relays. Transfers, Puppets and Dialogue Bidding as well as creative ideas about Slam Bidding and Deception. The book addresses the conflicting requirements for a system that must be robust but also accurate.