Deduction is the process of working out what logically follows from facts known or assumed. Psychologists rate deductive reasoning as central to human intelligence and Albert Dormer believes that it is the use of this faculty in bridge that gives players their satisfaction. So why do they so often fail to make the right deductions?

The answer lies in correct thinking and in asking the right questions. Albert Dormer, internationally respected both as a player and as a writer of great distinction, shows how, through the...