ECO E45: Nimzo-Indian Defense

ECO E45 is part of volume E — Indian Defenses. The Lichess chess-openings dataset files one named line under it. It is Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6.

That position has come up in 13,478 Lichess games between players rated 1600 to 2500: White won 46.7%, 8.5% were drawn and Black won 44.8%.