ECO A31: English Opening

ECO A31 is part of volume A — Flank Openings. The Lichess chess-openings dataset files one named line under it. It is English Opening: Symmetrical Variation, Anti-Benoni Variation: 1. c4 Nf6 2. d4 c5 3. Nf3.

That position has come up in 1,571,771 Lichess games between players rated 1600 to 2500: White won 47.1%, 6.7% were drawn and Black won 46.2%.