ECO E23

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 E23.

• Nimzo-Indian Defense: Spielmann Variation, Carlsbad Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2
• Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6
• Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation — 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5