The strategy and tactics associated with the open file are explained here clearly and comprehensively&;how files are opened, blocked, occupied, and exploited as roads along which to invade the enemy position. A brief introduction lays the theoretical foundations and is followed by illustrative games, in all of which the open file is the dominant or deciding factor. In each game there is a pause at a key position where a clear verbal assessment is given; these assessments teach the reader how strong chess players think&;what to look for, how to assess, and how to plan. Th benefits not only from Gerhard Schmidt&;s experience as a trainer but also from the huge knowledge and skill gained by Grandmaster Wolfgang Uhlmann during his long and successful career in top-class chess.