1. c2c4  1... e7e5  2. g2g3  2... g8f6  3. f1g2  3... d7d5  4. c4d5  4... f6d5  5. g1f3  5... b8c6  6. e1g1  6... d5b6  7. b2b3  7... f8e7  8. c1b2  8... f7f6  9. b1a3 A novelty. The knight is moving towards the c2  square from where it can support the central break with d2-d4. 9... c8e6  10. a3c2  10... e8g8  11. e2e4 An important part in White's plan. 11... d8d3  12. f1e1  12... a8d8 The main reason for Black's problems. Choosing  the right rook to place on a file is an eternal problem for players at all levels. This rook seems to be more natural contender for the open file as  the other one can be quite useful on the kingside. However, there is a  minor tactical defect in the position which ruins this logic. 13. g2f1 Caruana frees himself in the center and gets better position. 13... d3d7 