ECO volume C: Open games and the French Defense

ECO C97

2 named openings and variations are classified as C97. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.

Ruy Lopez: Closed, Chigorin DefenseC971. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5
Ruy Lopez: Closed, Chigorin, Yugoslav SystemC971. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bd7 13. Nf1 Rfe8 14. Ne3 g6