Nimzo-Indian Defense

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
4.e3  Rubinstein               4.Qc2  Classical                4.Nf3  Three Knights
  4...b6  5.Bd3  Bb7             4...d5  5.a3   Bxc3+            4...b6  5.Qb3 a5
  Fischer 5.Nge2 Ne4                     5.cxd5 exd5                     5.Bg5 Bb7
  4...0-0 5.Nge2 d5  Reshevsky   4...0-0 5.a3 Bxc3+ 6.Qxc3       4...0-0 5.Bg5
          5.Bd3  d5                             6...b6  7.Bg5    4...c5  5.g3 5...Nc6
          5.Nf3  d5                             6...Ne4 7.Qc2                 5...cxd4
  4...c5  5.Nf3  Nc6 Hubner      4...c5  5.dxc5 5...Bxc5 6.Nf3
          5.Bd3  Nc6                            5...0-0  6.a3
          5.Nge2 cxd4                           5...Na6  6.a3

4.a3 Bxc3+ Saemisch    4.f3  d5 Saemisch     4.Bg5 h6 Leningrad
4.g3 0-0               4.Qb3 c5 Spielmann    4.Bd2 0-0

4.e3 Rubinstein Variation
4...b6 Fischer's System
5.Bd3 Bb7 6.Nf3 Ne4 7.Qc2 f5 8.0-0 Bxc3 9.bxc3 0-0 (DP)
->

5.Nge2 Ne4 6.Qc2 Bb7 7.a3 Bxc3+ 8.Nxc3 Nxc3 9.Qxc3 0-0
->

4...0-0
5.Nge2 d5 6.a3 Be7 7.Nf4 c6 8.Bd3 (Retreat)
Reshevsky Variation
->

5.Bd3 d5 6.cxd5 exd5 7.Nge2 Re8 8.0-0 Bd6 9.f3 c5 (Retreat)
->

5.Nf3 d5 6.Bd3 c5 7.0-0 cxd4 8.exd5 dxc4 9.Bxc4 (W:IQP)
->

4...c5
5.Nf3 Nc6 6.Bd3 Bxc3+ 7.bxc3 d6 8.e4 e5 9.d5 Ne7 (DP)
Hubner System
->

5.Bd3 Nc6 6.Nge2 cxd4 7.exd4 d5 8.cxd5 Nxd5 9.0-0 0-0 (W:IQP)
->

5.Nge2 cxd4 6.exd4 d5 7.a3 Be7 8.c5 0-0 9.g3 b6 10.b4 (Retreat)
->

4.Qc2 Classical Variation
4...d5
5.a3 Bxc3+ 6.Qxc3 Ne4 7.Qc2 c5 8.dxc5 Nc6 9.cxd5 exd5 10.Nf3 (B:IQP)
->

5.cxd5 exd5 6.Bg5 h6 7.Bh4 c5 8.dxc5 g5 9.Bg3 Ne4 10.e3 Qa5 (B:IQP)
->

4...0-0 5.a3 Bxc3+ 6.Qxc3
6...b6 7.Bg5 Bb7 8.f3 h6 9.Bh4
->

6...Ne4 7.Qc2 f5 8.Nh3
->

4...c5 5.dxc5
5...Bxc5 6.Nf3 Qb6 7.e3 Qc7 8.b3 a6 9.Bb2 b6
->

5...0-0 6.a3 Bxc5 7.Nf3 Nc6 8.Bg5 Nd4 9.Nxd4 Bxd4 10.e3 Qa5 11.exd4 Qxg5
->

5...Na6 6.a3 Bxc3+ 7.Qxc3 Nxc5 8.f3 d5 9.cxd5 b6 10.b4 Na4
->

4.Nf3 Three Knights Variation
4...b6
5.Qb3 a5 6.a3 a4 7.Qc2 Bxc3+ 8.Qxc3 Bb7
->

5.Bg5 Bb7 6.e3 h6 7.Bh4 g5 8.Bg3 Ne4 9.Qc2 Bxc3+ 10.bxc3 (DP)
->

4...0-0
5.Bg5 h6 6.Bh4 c5 7.e3 cxd4 8.exd4 d5 9.Rc1
->

4...c5 5.g3
5...Nc6 6.Bg2 Ne4 7.Bd2 Nxd2 8.Qxd2 cxd4 9.Nxd4 0-0 (B:DB)
->

5...cxd4 6.Nxd4 0-0 7.Bg2 d5 8.cxd5 Nxd5 9.Qb3
->

4.a3 or 4.f3 Saemisch Variation
4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.cxd5 Nxd5 8.Qd3 b6 9.e4 Ba6 10.Qd2 Bxf1 11.Kxf1 Ne7
->

4.f3 d5 5.a3 Be7 6.e4 dxe4 7.fxe4 e5 8.d5 Bc5 9.Nf3 Ng4 (Retreat)
->


4.Bg5 Leningrad Variation
4...h6 5.Bh4 c4 6.d5 d6 7.e3 Bxc3+ 8.bxc3 e5 9.Bd3 Qe7 10.Ne2 g5 11.Bg3 Nbd7 (DP)
->

6.Others
4.g3 0-0 5.Bg2 Bxc3+ 6.bxc3 d6 7.Nf3 Nc6 8.0-0 e5 (DP)
->

4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2 8.Nxd2 f5 (DP), (B:DB)
Spielmann
->

4.Bd2 0-0 5.a3 Bxc3 6.Bxc3 Ne4
->