King's Gambit Accepted: Cunningham Defense, Bertin Gambit

The King's Gambit Accepted: Cunningham Defense, Bertin Gambit is a chess opening classified under ECO code C35 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. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3. The resulting position leaves black to move.