Caro-Kann Defense: Panov Attack, Modern Defense, Reifir-Spielmann Line

The Caro-Kann Defense: Panov Attack, Modern Defense, Reifir-Spielmann Line is a chess opening classified under ECO code B13 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 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 Qb6. The resulting position leaves white to move.