ECO E42
3 named openings and variations are classified as E42. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Nimzo-Indian Defense: Rubinstein System, Rubinstein VariationE421. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2
- Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Main LineE421. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. a3
- Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Sherbakov AttackE421. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. c5