The Semi-Slav has been one of the most topical openings of the last decade, and its most critical variation is the Botvinnik System (5 Bg5 dxc4). Most of today's top grandmasters, including Kasparov, Kramnik and Shirov, have relied on it as Black, White, or both, especially in make-or-break situations. Written by IM Steffen Pedersen who achieved a GM norm at 16 and has written several highly-regarded books. Other Gambit Test Your Chess, The Meran System, The Main Line 3 Nc3, The Tarrasch Variation, Advance and Other Lines, The Gambit Guide to the Bogo-Indian, The Gambit Guide to the Benko Gambit.