ECO Index E - E20-59
E20 Nimzo-Indian Defense
E21 Nimzo-Indian, Three Knights Variation
E22 Nimzo-Indian, Spielmann Variation
E23 Nimzo-Indian, Spielmann, 4...c5 5.dxc5 Nc6
E24 Nimzo-Indian, Saemisch Variation
E25 Nimzo-Indian, Saemisch Variation, Keres Variation
E26 Nimzo-Indian, Saemisch Variation, 4.a3 Bxc3+ 5.bxc3 c5 6.e3
E27 Nimzo-Indian, Saemisch Variation, 5...0-0
E28 Nimzo-Indian, Saemisch Variation, 6.e3
E29 Nimzo-Indian, Saemisch Variation, Main Line
E30 Nimzo-Indian, Leningrad Variation
E31 Nimzo-Indian, Leningrad Variation, Main Line
E32 Nimzo-Indian, Classical Variation
E33 Nimzo-Indian, Classical Variation, 4...Nc6
E34 Nimzo-Indian, Classical, Noa Variation
E35 Nimzo-Indian, Classical, Noa Variation, 5.cxd5 exd5
E36 Nimzo-Indian, Classical, Noa Variation, 5.a3
E37 Nimzo-Indian, Classical, Noa Variation, Main Line, 7.Qc2
E38 Nimzo-Indian, Classical, 4...c5
E39 Nimzo-Indian, Classical, Pirc Variation
E40 Nimzo-Indian, 4.e3
E41 Nimzo-Indian, 4.e3 c5
E42 Nimzo-Indian, 4.e3 c5 5.Ne2, Rubinstein Variation
E43 Nimzo-Indian, Fischer Variation
E44 Nimzo-Indian, Fischer Variation, 5.Ne2
E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation
E46 Nimzo-Indian, 4.e3 O-O
E47 Nimzo-Indian, 4.e3 O-O 5.Bd3
E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5
E49 Nimzo-Indian, 4.e3, Botvinnik System
E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, w/o ...d5
E51 Nimzo-Indian, 4.e3 O-O 5.Nf3 d5
E52 Nimzo-Indian, 4.e3, Main Line with ...b6
E53 Nimzo-Indian, 4.e3, Main Line with ...c5
E54 Nimzo-Indian, 4.e3, Gligoric System with 7...dxc4
E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation
E56 Nimzo-Indian, 4.e3, Main Line with 7...Nc6
E57 Nimzo-Indian, 4.e3, Main Line with 8...dxc4 and 9...Bxc4 cxd4
E58 Nimzo-Indian, 4.e3, Main Line with 8...Bxc3
E59 Nimzo-Indian, 4.e3, Main Line
Maybe you can find a nice line or two within the
Nimzo-Indian (E20-59).