Sicilian Defense: Kan Variation, Wing Attack

The Sicilian Defense: Kan Variation, Wing Attack is a chess opening classified under ECO code B43 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 5 moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5. The resulting position leaves white to move.