Power Play 18: The Sicilian Najdorf &ndash; a repertoire for Black Chess Software Power Play 18: The Sicilian Najdorf  a repertoire for Black DVD On this DVD he explains the fundamental principles of the opening and offers a repertoire of systems for Black against all of Whites major alternatives. Whether you are new to the Najdorf or already have experience with the opening, this DVD is suitable for you. Strategy is often determined by pawn structure, and as Blacks structure is often the same in many variations of the Najdorf,