Petrov’s Defence (also called Petroff’s Defence, Russian Game and Russian Defence) is a chess opening characterized by the following moves: 1. E4 e5 2 Nf3 Nf6 Though it has a reputation for being dull, the Petrov offers many possibilities for Black. Grandmasters Karpov, Yusupov, Smyslov, Marshall, Krammik and Pillsbury have frequently played the Petrov as Black.