Vienna Game: Paulsen Variation, Mariotti Gambit

The Vienna Game: Paulsen Variation, Mariotti Gambit is a chess opening classified under ECO code C25 in the Open Games & French Defense family, beginning with 1.e4 e5 or 1.e4 e6, including the Italian Game, Ruy Lopez, and French Defense. It is reached after 5 moves: 1. e4 e5 2. Nc3 Nc6 3. g3 Bc5 4. Bg2 h5 5. Nf3 h4. The resulting position leaves white to move.