Raetsky/Chetverik: Petroff Defence improvers GM Ivan Sokolov is a

GM Ivan Sokolov is a Yugoslav and twice Dutch Champion with decades of experience of elite chess

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Suitable for club and tournament players new to computer-assisted chess

Raetsky/Chetverik: Petroff Defence improvers GM Ivan Sokolov is aThe Petroff Defense 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 avoids 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,