ECO B91: Sicilian Defense

ECO B91 is part of volume B — Semi-Open Games. The Lichess chess-openings dataset files one named line under it. It is Sicilian Defense: Najdorf Variation, Zagreb Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3.

That position has come up in 275,423 Lichess games between players rated 1600 to 2500: White won 48.2%, 5.9% were drawn and Black won 45.9%.