1. c2c4  1... g8f6  2. g1f3  2... d7d6 Already a surprise. Caruana plays the KID very, very  rarely. 3. d2d4  3... g7g6  4. b1c3  4... f8g7  5. e2e4  5... e8g8  6. f1e2  6... e7e5  7. e1g1  7... c8g4 This is what the American wanted to try, a relatively fresh  line. 8. c1e3  8... g4f3 The main point behind Black's idea. He wins a few tempi  chasing the enemy bishops back. 9. e2f3  9... e5d4  10. e3d4  10... b8c6  11. d4e3  11... f8e8  12. d1d2  12... f6d7  13. a1d1  13... g7c3 An important novelty which softens the  e4-pawn, just as in the line from above. 14. d2c3  14... d8f6  15. c3c1  15... d7c5  16. c1b1 The queen ended defending the pawn anyway. 16... f6e6 Aggressive play by Caruana. 17. f1e1  17... e6c4 Black has won a pawn, but the bishop pair cannot be  underestimated. 18. b2b3  18... c4c3 The queen is best located on the long  diagonal. 19. e3d2  19... c3f6  20. d2c1  20... h7h5 And this is an aggressive blockade. By advancing  the h-pawn, Black first secures the strong e5-outpost for his knight and  can later push his kingside pawns even farther. 21. c1b2  21... c6e5  22. f3e2  22... h5h4 Threatening h4-h3 immediately or after the  preliminary Qf6-f4. 23. b1c1  23... g6g5  24. e2b5 Wojtaszek is trying to provoke some pawn pushes in  order to get some objects to attack. 24... e8e7 But Caruana rejects even that. 25. e1e3  25... f6g6 It all goes very smoothly for Black. He slowly brings  everybody into the attack. 26. b5e2  26... a8e8  27. c1c2  27... c5e6  28. f2f3 And this  might make things even worse for Wojtaszek. 28... e6f4  29. e2f1  29... c7c6 Only now does he push the pawn, once that White  can no longer attack. 30. c2f2  30... e7e6 The rook lift is the last  preparation before the final storm. Wojtaszek was also short of time, and  it is even more unpleasant for him psychologically not to force anything. 31. e3c3  31... d6d5 Now he can! 32. g2g3 This loses immediately, but it is really  hard to provide White good advice. 32... h4g3  33. h2g3  33... d5e4 Nicely calculated. All the black pieces now make perfect sense. 34. g3f4  34... g5f4  35. f2g2  35... e4f3 The point behind the sacrifice. White can  get mated in the endgame too.