ECO E20
6 named openings and variations are classified as E20. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Nimzo-Indian DefenseE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4
- Nimzo-Indian Defense: Dilworth GambitE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e4
- Nimzo-Indian Defense: Kmoch VariationE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3
- Nimzo-Indian Defense: Mikenas AttackE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qd3
- Nimzo-Indian Defense: Romanishin VariationE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3
- Nimzo-Indian Defense: Romanishin Variation, English HybridE201. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. g3 cxd4 6. Nxd4 O-O 7. Bg2 d5 8. cxd5 Nxd5