ECO C94: Ruy Lopez

ECO C94 is part of volume C — Open Games. The Lichess chess-openings dataset files 2 named lines under it. The shortest is Ruy Lopez: Closed, Breyer Defense: 1. 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 Nb8.

That position has come up in 138,628 Lichess games between players rated 1600 to 2500: White won 47.3%, 6.8% were drawn and Black won 45.9%.