1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... a7a6 This variation is a curious case of a defense that is known equally by two names: some call it the Kan, some call it the Paulsen. It's a daring choice for someone who just needs a draw, but Carlsen knows what he's doing. He doesn't play it too often, although he has tried it a few times. 5. b1c3 This, and 5.Bd3, have always been the main lines, but 5.c4 is also very popular. 5... d8c7 