The Najdorf is the most popular line of the Sicilian Defence for a very good reason: Black can play for a win without taking undue risks. The Najdorf's fundamental soundness has been confirmed in countless top-level games, and in particular by Garry Kasparov's successful use of it throughout his career. White has tried a wide variety of approaches against the Najdorf, including quiet positional lines and the traditional main line with 6 Bg5. Recently the idea of a rapid kingside pawn advance has found favour. The Najdorf's landscape changes rapidly, and this presents its devotees with a complex task: they must not only keep up-to-date with sharp theoretical lines, but must also have a firm grasp of the strategies that underpin the main systems, both old and new. This book lends a helping hand to those who play the Najdorf or wish to take up this complex opening. Two Najdorf experts from Spain present a flexible repertoire for Black, including a wealth of original analysis of the critical variations. They also explain the key ideas behind the Najdorf, focusing on those plans that are most relevant to modern practice.