Sicilian Defense: Closed, Korchnoi Defense

The Sicilian Defense: Closed, Korchnoi Defense is a chess opening classified under ECO code B23 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 3 moves: 1. e4 c5 2. Nc3 e6 3. g3 d5. The resulting position leaves white to move.