ECO E01: Catalan Opening

ECO E01 is part of volume E — Indian Defenses. The Lichess chess-openings dataset files one named line under it. It is Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2.

That position has come up in 1,063,701 Lichess games between players rated 1600 to 2500: White won 51.3%, 6.8% were drawn and Black won 41.9%.