ECO C76: Ruy Lopez

ECO C76 is part of volume C — Open Games. The Lichess chess-openings dataset files one named line under it. It is Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Fianchetto Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. c3 a6 5. Ba4 d6 6. d4 Bd7.

That position has come up in 8,835 Lichess games between players rated 1600 to 2500: White won 45.6%, 6.3% were drawn and Black won 48.1%.