1. e2e4  1... e7e5  2. g1f3  2... g8f6 The Petroff has always been a reputable defense, but lately it's appearing more and more in elite games, having been GM Nepomniachtchi's main weapon in the 2022 Candidates Tournament. 3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. d2d4  5... d6d5  6. f1d3  6... f8d6  7. e1g1  7... e8g8  8. c2c4  8... c7c6  9. f1e1  9... c8f5  10. d1b3  10... d8d7 All this is the latest fashion in opening theory. Here Caruana played the now famous novelty 11.Nh4 and got a great position against Nepomniachtchi in the Candidates Tournament, despite the game ending in a draw. 11. c4c5  11... d6c7  12. b3c2 This move is a theoretical novelty. 12.Nc3 and 12.Nbd2 are more common. The idea is to challenge the e4-knight. 12... b8a6  13. a2a3  13... f5g6 A natural move, setting up …f7-f5 to secure the knight on e4. 14. b1c3  14... f7f5  15. c3e2 Taking the knight to the kingside, where it protects the white monarch. 15... g6h5  16. e2g3  16... h5g6  17. g3e2  17... g6h5  18. e2g3  18... h5g6  19. b2b4 So refuses the draw offer. 19... a8e8  20. c1b2 The position is difficult to evaluate, as both sides have their strengths. White wants to put the knight on e5 and then kick out the black knight with the f2-f3 move. Black, on the other hand, has a problem with the a6-knight, which is completely out of the game. There is a move that struggles to solve both problems. 20... e8e6  21. g3e2 The knight dance continues. 21... d7e7  22. f3e5 Now is the right time. 22... f5f4  23. e5g6  23... e6g6  24. f2f3  24... e7h4  25. e2c3  25... g6h6  26. h2h3 