1. f2f4 The opening position is begging for a Stonewall and Fedoseev quickly builds one as White. 1... d7d5  2. e2e3  2... b8c6  3. d2d4  3... e7e6  4. h1f2 One of the good options. 4... g7g5 Carlsen on his turn is fighting for the center at once. 5. c2c3  5... c8d7  6. b1d2  6... h8g6  7. d2f3 