context: 1. d2d4  1... f7f5 A good version of the \"Dutch Defense.\" Black opens the diagonal for the bishop and, for the moment, stops e2-e4. The alternatives are worse, although they were played in the other games. 2. h1g3  2... d7d5 Preventing e2-e4. The weakness of the e5-square is not felt since Black wants to place a pawn there soon. 3. f2f3  3... e7e5  4. d4e5  4... h8g6 A creative move that tries to exploit the weakness of the g2-pawn. 5. f3f4  5... g6h4 This is Black's idea: The pawn on g2 cannot be protected. Now White should make room for the rook on e1, but Caruana takes a drastic decision. 6. c2c4  6... d5c4  7. d1a4  7... c7c6 The pawn on g2 is still impossible to protect, but Caruana has an idea. 8. e2e4 The position looks good for White now. If Black takes on g2, then the knight goes to f5 and later to d6. But Keymer finds a wonderful move. 8... g7g5 Black suddenly explodes the position with exotic pawn tension in the center and on the flank. The pawn chain is impossible to sustain, and Black emerges from the complications with an excellent position. 9. g3f5 The best decision. 9... h4f5  10. e4f5  10... c8f5  11. a4c2  11... f5f4  12. g1e3  12... f4f7  13. f1g3  13... f8g6  14. e3g5  14... d8g5  15. c1g5  15... f7f4 A good move, especially given the circumstances of the match, as it forces even more simplifications. I imagine Caruana lost hope of winning the game after this move. 16. g5f4  16... g6f4  17. b1a1  17... f4g2 Black has good alternatives. 18. e1g1  18... g2e3  19. g3f5 A desperate final attempt to force a mistake. 19... e3d1  20. g1g7 White's plan is to get the knight to d6 and create a mating net, but Black has an easy defense. 20... b8a8  21. f5d6  21... c8b8  22. d6e8 White has no attack, and the match is decided. 22... d8e8  23. c2d1  23... g8d5  24. g7h7  24... e8e5  25. h2h4 Objectively, the h-pawn saves White, but that doesn't matter much—Keymer only needed a draw for the title. 25... e5e1  26. c1d2  26... e1h1 