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ECO E30

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 E30.

Nimzo-Indian Defense: Leningrad Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5
Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 b5