The Sicilian Flank Game presents the Najdorf Variation of the Sicilian Defence, one of the most challenging and rewarding of defences. The characteristic moved were first developed bu the Czechs into a vigorous sytem of counterplay, which undermines the White centre by operations on the queen's flank. In the hands of the Argentinian Miguel Najdorf, and of other leading grandmasters, notably Robert J. Fischer, it has become a formidable weapon in top-level chess. This study by a renowned internation grandmaster and writer classifies and analyses all the variations and demonstrates not only background strategy and tactics of the Njdorf but also the consequent middle and end game phases.