1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. g1f3  3... g8f6  4. e2e3  4... c8f5  5. b1c3  5... e7e6  6. f3h4  6... f5e4  7. f2f3  7... e4g6  8. c1d2  8... f8e7  9. h4g6  9... h7g6 Caruana chose a very solid line that he tested last  year at the (ongoing) Candidates.