ECO volume E: Indian defenses

ECO E53

2 named openings and variations are classified as E53. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.

Nimzo-Indian Defense: Normal Variation, Gligoric SystemE531. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5
Nimzo-Indian Defense: Normal Variation, Gligoric System, Keres VariationE531. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O b6