ECO D12
3 named openings and variations are classified as D12. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Slav Defense: Quiet Variation, Amsterdam VariationD121. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3 e6 7. Ne5 Nfd7
- Slav Defense: Quiet Variation, Landau VariationD121. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Qb3 Qc8 7. Bd2 e6 8. Na3
- Slav Defense: Quiet Variation, Schallopp DefenseD121. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5