1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... f8e7 Caruana played this line before in the tournament, against Dominguez, when he saved a lost position. 5. e1g1  5... e8g8  6. b1c3  6... d7d6  7. a2a4  7... c8g4  8. h2h3  8... g4h5  9. c1e3  9... c6d4  10. e3d4  10... e5d4  11. c3d5  11... f6d5  12. c4d5  12... c7c6  13. d5b3 White now is threatening 14.g4 followed by the capture of the d-pawn. 13... h5f3 