ECO volume C: Open games and the French Defense

ECO C90

3 named openings and variations are classified as C90. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.

Ruy Lopez: Closed, Lutikov VariationC901. 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. Bc2
Ruy Lopez: Closed, Pilnik VariationC901. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. d3 d6 9. c3
Ruy Lopez: Closed, Suetin VariationC901. 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. a3