1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... f7f5 Carlsen is never shy to try something  different. He had only played this move twice before in his career, in  2008 and 2014. 4. d2d3 A modest, but unplesant move against the Schlieman. White does not intend to refute the opening but wants to exploit the  weakening of the a2-g8 diagonal in the future. 4... f5e4  5. d3e4  5... g8f6 