ECO C87: Ruy Lopez

ECO C87 is part of volume C — Open Games. The Lichess chess-openings dataset files one named line under it. It is Ruy Lopez: Closed, Averbakh Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 d6.

That position has come up in 206,518 Lichess games between players rated 1600 to 2500: White won 53.4%, 5.3% were drawn and Black won 41.3%.