Sicilian Defense: Alapin Variation, Sherzer Variation

The Sicilian Defense: Alapin Variation, Sherzer Variation is a chess opening classified under ECO code B40 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. c3 Nf6 4. e5 Nd5 5. d4 Nc6. The resulting position leaves white to move.