ECO E57: Nimzo-Indian Defense

ECO E57 is part of volume E — Indian Defenses. The Lichess chess-openings dataset files one named line under it. It is Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. a3 dxc4 9. Bxc4 cxd4.

That position has come up in 2,900 Lichess games between players rated 1600 to 2500: White won 50.4%, 6.4% were drawn and Black won 43.2%.