Home › Openings › Petrov's Defense › Petrov's Defense: Cochrane Gambit Petrov's Defense: Cochrane Gambit, Bishop Check Line ECO C42 · 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. Bc4+ Related variationsPetrov's Defense: Cochrane Gambit, Center Variation Practice this opening · Play against the computer