This book is part of a series from Quality Chess examining the cutting edge of opening theory. The idea is to identify the most important theoretical battlegrounds and then analyse as deeply as possible in search of improvements. Thus the reader will be ahead of the current state-of-the-art, rather than lagging behind trying to memorise old games. The book considers the Sicilian Najdorf - a favourite opening of ambitious players at every level. This book concentrates on lines where White chooses 6.Be3, heading for the English Attack. The variations covered are: Topalov: 6…e6 7.f3 b5 8.Qd2 b4 9.Na4 Nbd7; Topalov: 6…e6 7.f3 b5 8.g4 h6 9.Qd2 b4 10.Nce2 e5; Perenyi Attack: 6…e6 7.g4 e5 8.Nf5; Perenyi Attack: 6…e6 7.g4 h6 8.Bg2; Perenyi Attack: 6…e6 7.g4 h5 8.g5 Ng4 9.Bc1 Qb6 10.h3 Ne5 11.Nb3; Main line: 6…e6 7.f3 b5 8.g4 h6 9.GBPd2 Nbd7 10.0-0-0 Bb7 11.h4 b4 12.Na4 Qa5 13.b3 Nc5 14.a3; Main line: 6…e6 7.f3 Nbd7 8.GBPd2 b5 9.g4 Nb6 10.a4; Scheveningen: 5…Nc6 6.Be3 e6 7.Qd2 Be7 8.0-0-0 0-0 9.f3 d5 10.Be2; 6…e5: Positional line: 7.Nf3; and, 6…e5: Vallejo Pons variation: 7.Nb3 Be6 8.f3 Be7 9.Qd2 0-0 10.0-0-0 Nbd7 11.g 4 b5 12.g5 b4 13.Ne2 Ne8 14.f4 a5 15.f5; 6…e 5: line with 10…a5: 7.Nb3 Be7 8.f3 Be6 9.Qd2 0-0 10.0-0-0 a5; 6…e5: Topalov variation: 7.Nb3 Be6 8.f3 Nbd7 9.Qd2 h5.