Nimzo Indian

It has ECO code from E20-59
[Black "E20"]{ Nimzo-Indian Defence}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4

{E20 Nimzo-Indian Defence
Kmoch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3

{E20 Nimzo-Indian Defence
Mikenas Attack}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qd3

{E20 Nimzo-Indian Defence
Romanishin-Kasparov (Steiner) System}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.g3

[Black "E21"]{ Nimzo-Indian Defence
three Knights Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3

{E21 Nimzo-Indian Defence
three Knights, Korchnoi Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5

{E21 Nimzo-Indian Defence
three Knights, Euwe Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5 Ne4

[Black "E22"]{ Nimzo-Indian Defence
Spielmann Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3

[Black "E23"]{ Nimzo-Indian Defence
Spielmann, 4...c5, 5.dc Nc6}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6

{E23 Nimzo-Indian Defence
Spielmann, Karlsbad Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2

{E23 Nimzo-Indian Defence
Spielmann, San Remo Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5

{E23 Nimzo-Indian Defence
Spielmann, Staahlberg Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5 8.Qc2 f5 9.g3

[Black "E24"]{ Nimzo-Indian Defence
Saemisch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3

{E24 Nimzo-Indian Defence
Saemisch, Botvinnik Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.f3 d5 7.e3 O-O 8.cxd5 Nxd5

[Black "E25"]{ Nimzo-Indian Defence
Saemisch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.f3 d5 7.cxd5

{E25 Nimzo-Indian Defence
Saemisch, Keres Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.f3 d5 7.cxd5 Nxd5 8.dxc5
{E25 Nimzo-Indian Defence
Saemisch, Romanovsky Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.f3 d5 7.cxd5 Nxd5 8.dxc5 f5

[Black "E26"]{ Nimzo-Indian Defence
Saemisch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.e3

{E26 Nimzo-Indian Defence
Saemisch, O'Kelly Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 c5 6.e3 b6

[Black "E27"]{ Nimzo-Indian Defence
Saemisch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 O-O

[Black "E28"]{ Nimzo-Indian Defence
Saemisch Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 O-O 6.e3

[Black "E29"]{ Nimzo-Indian Defence
Saemisch, Main line}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 O-O 6.e3 c5 7.Bd3 Nc6

{E29 Nimzo-Indian Defence
Saemisch, Capablanca Variation}
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3 5.bxc3 O-O 6.e3 c5 7.Bd3 Nc6 8.Ne2 b6 9.e4 Ne8