Home › Openings › Petrov's Defense › Petrov's Defense: Damiano Variation Petrov's Defense: Damiano Variation, Kholmov Gambit ECO C42 · 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 Qe7 Practice this opening · Play against the computer