ECO A54
4 named openings and variations are classified as A54. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Old Indian Defense: Duz-Khotimirsky VariationA541. d4 Nf6 2. c4 d6 3. Nc3 e5 4. e3 Nbd7 5. Bd3
- Old Indian Defense: Tartakower-IndianA541. d4 Nf6 2. c4 d6 3. Nf3 Bg4
- Old Indian Defense: Two Knights VariationA541. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3
- Old Indian Defense: Ukrainian VariationA541. d4 Nf6 2. c4 d6 3. Nc3 e5