Caro-Kann Defense: Accelerated Panov Attack, Van Weersel Attack

The Caro-Kann Defense: Accelerated Panov Attack, Van Weersel Attack is a chess opening classified under ECO code B10 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. c4 d5 3. cxd5 cxd5 4. Qb3. The resulting position leaves black to move.