The Caro-Kann Defense: Main Line is a chess opening classified under ECO code B15 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. Nd2 dxe4 4. Nxe4. The resulting position leaves black to move.
Resulting Position
1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4
rnbqkbnr/pp2pppp/2p5/8/3PN3/8/PPP2PPP/R1BQKBNR b KQkq - 0 4Resulting Position