ECO E51

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 E51.

• Nimzo-Indian Defense: Normal Variation, Ragozin Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5
• Nimzo-Indian Defense: Normal Variation, Sämisch Deferred — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.a3
• Nimzo-Indian Defense: Ragozin Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 Nc6 7.O-O dxc4