Pirc Defense: Classical Variation, Quiet System, Chigorin Line

The Pirc Defense: Classical Variation, Quiet System, Chigorin Line is a chess opening classified under ECO code B08 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 6 moves: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 O-O 6. O-O Nc6. The resulting position leaves white to move.