D43 Semi-Slav Defense, with 5.Bg5

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5

• D52 Queen's Gambit Declined

  5...Nbd7 6.e3

• D44 Semi-Slav Defense: Botvinnik Variation

  5...dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5

• D43 Semi-Slav Defense

  5...h6 6.Bxf6 Qxf6 7.e3