ECO B59: Sicilian Defense

ECO B59 is part of volume B — Semi-Open Games. The Lichess chess-openings dataset files one named line under it. It is Sicilian Defense: Boleslavsky Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3.

That position has come up in 140,798 Lichess games between players rated 1600 to 2500: White won 46.6%, 6.3% were drawn and Black won 47.1%.