1Grandmaster Repertoire 17 The Classical Slav provides a sound and active chess opening repertoire for Black based on 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4. White's early deviations from move 3 onwards are also covered. Boris Avrukh has had the Slav in his repertoire throughout his career and has never lost a serious game with it."