ECO B99: Sicilian Defense

ECO B99 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, Main Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7 9. O-O-O Nbd7.

That position has come up in 347,417 Lichess games between players rated 1600 to 2500: White won 51.8%, 4.6% were drawn and Black won 43.6%.