Italian Game: Evans Gambit Declined

The Italian Game: Evans Gambit Declined is a chess opening classified under ECO code C51 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 4 moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6. The resulting position leaves white to move.