ECO E18

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

3 named opening lines are classified under ECO code E18.

• Queen's Indian Defense: Classical Variation, Tiviakov Defense — 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Na6
• Queen's Indian Defense: Classical Variation, Traditional Variation — 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3
• Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line — 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 d5