Van Geet Opening: Berlin Gambit

The Van Geet Opening: Berlin Gambit is a chess opening classified under ECO code B00 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 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5. The resulting position leaves black to move.