Raetsky/Chetverik: Petroff DefenceThe Petroff Defence is considered as one of Black's most reliable methods of meeting the king's pawn opening. By counterattacking as early as move two, Black avoid the hazards of having to face lines such as the Scotch Opening, the Italian Game and the "Spanish torture" of the Ruy Lopez. An early breach of a central file together with active piece play for both sides characterises the Petroff as a typical king's pawn opening. Until a few years ago,