1. g1f3  1... d7d5  2. e2e3  2... g8f6  3. c2c4  3... c7c6  4. b1c3  4... a7a6 This system in which Black plays the pawns to c6 and a6 is called the Chebanenko. It was one of the favorite defenses of GM Morozevich, one of the most original chess players in history. Black breaks the normal rules of the opening and prepares to advance the pawn to b5 before completing development.