The black queenside pawns are crippled but control the  center.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... e7e6  4. b5c6  4... b7c6  5. d2d3  5... g8e7  6. b2b3  6... e7g6  7. h2h4  7... h7h5  8. e4e5  8... f7f6  9. b1d2 Caruana offers a pawn. 9... d7d6 ...which Carlsen does not like. 10. e5d6 