This book is the first in a new series from Quality Chess examining the cutting edge of chess opening theory. The idea is to identify the most important theoretical battlegrounds of the moment and then analyze 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 memorize old games. In The Cutting Edge1 - The Open Sicilian 1 the variations covered are: Sveshnikov 13.Nxb5 piece sac: 9.Bxf6 gxf6 10.Nd5 f5 11.Bd3 Be6 12.c3 Bg7 13.Nxb5 axb5 14.Bxb5 Sveshnikov 18.h4 pawn sac: 9.Nd5 Be7 10.Bxf6 Bxf6 11.c3 0-0 12.Nc2 Bg5 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Rb8 16.b3 Kh8 17.Nce3 g6 18.h4!? Sveshnikov: 9.Nd5 Be7 10.Bxf6 Bxf6 11.c4 Rauzer, doubled f-pawn variation: 6.Bg5 e6 7.Qd2 a6 8.0-0-0 Bd7 9.f4 b5 10.Bxf6 gxf6 Chinese Dragon: 9.Bc4 Bd7 10.0-0-0 Rb8 Dragon, 12...Re8 system: 9.Bc4 Bd7 10.0-0-0 Rc8 11.Bb3 Ne5 12.Kb1 Re8 Dragon, Topalov variation: 9.Bc4 Bd7 10.0-0-0 Rc8 11.Bb3 Nxd4 12.Bxd4 b5 Taimanov, English Attack main line: 5.Nc3 Qc7 6.Be3 a6 7.Qd2 Nf6 8.f3 Bb4 9.0-0-0 Taimanov, English Attack with 8... Be7: 5.Nc3 Qc7 6.Be3 a6 7.Qd2 Nf6 8.0-0-0 Be7 9.f3 Taimanov with 5...a6: 5.Nc3 a6 6.Nxc6 bxc6 7.Bd3 Kan: 5.Nc3 Qc7 6.Bd3 Nf6 7.0-0 Bc5 Kan: 5.Bd3 Bc5