1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... a7a6 The Paulsen Variation has a somewhat dubious reputation in elite circles these days, but Carlsen has played it a few times. 5. f1d3  5... d8c7 