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ECO E40

ECO E00–E99 — Indian Defenses: 1.d4 Nf6 with the Nimzo-Indian, Queen's Indian, Catalan and King's Indian complexes.

2 named opening lines are classified under ECO code E40.

Nimzo-Indian Defense: Rubinstein System — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3
Nimzo-Indian Defense: Rubinstein System, Taimanov Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 Nc6