This position is super-fresh,  although there is one recent top-GM game.
1. b2b3 Despite the poor start, Carlsen does not mind experimenting. 1... e7e5  2. c1b2  2... b8c6  3. c2c4 Switching to the reversed Sicilian. 3... g8f6  4. g1f3  4... e5e4  5. f3d4  5... f8c5 