ECO E09
4 named openings and variations are classified as E09. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Catalan Opening: Closed Variation, Rabinovich VariationE091. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Qc2 e6 5. Nbd2 Be7 6. g3 Nbd7 7. Bg2 O-O 8. O-O b5
- Catalan Opening: Closed Variation, Traditional VariationE091. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 b6
- Catalan Opening: Closed, Main LineE091. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2
- Catalan Opening: Closed, Sokolsky VariationE091. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 b6 9. b3 a5 10. Bb2 Ba6