Caro-Kann Defense: Advance Variation, Prins Attack

The Caro-Kann Defense: Advance Variation, Prins Attack is a chess opening classified under ECO code B12 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 4 moves: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. b4. The resulting position leaves black to move.