The Four Knights has the distinction of being one of the oldest openings in the history of chess. In a king's pawn opening, both players bring out their knights before contemplating further development. Despite its deceptively peaceful appearance, the Four Knights can lead to wild gambit play as well as calmer positional waters. Adherents include the renowned tactician from Latvia, Alexei Shirov. International Master Jan Pinski delves into the secrets of the Four Knights for the first time, studying the tactical and strategic ideas for both White and Black players. Pinski covers both the fashionable main lines and the tricky sidelines, bringing readers right up to date with the expanding theory.