Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line

The Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line is a chess opening classified under ECO code C58 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 6 moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+. The resulting position leaves black to move.