ECO B93: Sicilian Defense

ECO B93 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, Amsterdam Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4.

That position has come up in 405,165 Lichess games between players rated 1600 to 2500: White won 50.0%, 4.8% were drawn and Black won 45.1%.