D30: Queen's Gambit Declined without 3.Nc3: 1.d4 d5 2.c4 e6
D31: Queen's Gambit Declined, Alatortsev Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7
D31: Semi-Slav without ...Nf6: 1.d4 d5 2.c4 e6 3.Nc3 c6
D32: Tarrasch Defence sidelines: 1.d4 d5 2.c4 e6 3.Nc3 c5
Black forces to exchange d4-pawn to develop his pieces. White aims to attack the isolated d-pawn
D33: Tarrasch Defence, 6.g3 sidelines: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd5 5.Nf3 Nc6 6.g3
D34: Tarrasch Defence, 6.g3 Nf6 7.Bg2 Be7: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd5 5.Nf3 Nc6 6.g3
Nf6 7.Bg2 Be7
D35: ......................., early deviations: 1.d4 d5 2.c4 e6 3.Nc3 Nf6
D35: ......................., Exchange Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5
D36:
Queen's Gambit Declined, Exchange Variation main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 Be7 6.Qc2
D37: ....................... 5.Bf4: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Be7 5.Bf4
D38: Queen's Gambit Declined, Ragozin Defence: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4
D39: ........................, Ragozin Defence with 5.Bg5 dxc4: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4 5.Bg5 dxc4
D40-42:
Queen's Gambit Declined, Semi-Tarrasch Defence: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5
D43-49:
Queen's Gambit Declined, Semi-Slav: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 h6
D50: Queen's Gambit Declined, Dutch-Peruvian Gambit: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5
D50: ......................., Orthodox Variation sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5
D51: ......................., 4.Bg5 Nbd7 sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7
D52: ......................., Cambridge Springs Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7
5.e3 c6 6.Nf3 Qa5
Orthodox Variation: White wants to get the space advantage. Black can have the difficulties tu uae his Queen's Bishop.
D53: Queen's Gambit Declined, Orthodox Variation early deviations: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5
Be7
D54: ......................., Orthodox Variation without Nf3: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7
5.e3 O-O 6.Rc1
D55: ......................., Orthodox Variation without ...h6: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5
Be7 5.e3 O-O 6.Nf3
D56: ......................., Lasker Variation sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3
O-O 6.Nf3 h6 7.Bh4 Ne4
D57: ......................., Lasker Variation main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3
O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.cxd5 exd5
Black forces the exchange of the Bishops
D58: ......................., Tartakower Defence sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7
5.e3 O-O 6.Nf3 h6 7.Bh4 b6
The aim of b6 is to develop the c8-Bishop and to support c5 move. h6 defends g5 square. White tries to control c-file.
D59: Queen's Gambit Declined, Tartakower Defence main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7
5.e3 O-O 6.Nf3 h6 7.Bh4 b6 8.cxd5 Nxd5
D60-69: Queen's Gambit Declined, Classical Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 h6