Caro-Kann Defense: Spike Variation, Scorpion-Grob Gambit

The Caro-Kann Defense: Spike Variation, Scorpion-Grob Gambit 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. g4 d5 3. Nc3 dxe4 4. d3. The resulting position leaves black to move.