1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f8e7  6. d2d3  6... b7b5  7. a4b3  7... d7d6 Together with 8.a4 and 8.c3, this is one the main lines of this Ruy Lopez system. 8. a2a3  8... c6a5 A known move, but much rarer than the most natural castling. 9. b3a2  9... c7c5  10. b1c3  10... c8e6  11. c1g5 A solid and typical move. The plan is to capture the knight and gain control of the d5-square. 11... e8g8  12. g5f6  12... e7f6  13. c3d5  13... g7g6  14. d1d2  14... f6g7 A new move, but as usual in this match, it's never clear to me if Ding has the position prepared or if he's improvising on the board. 15. f3g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] This is the problem. Now this unpleasant knight move is possible. 15... c5c4 Quite a risky move, unless it was prepared beforehand; as I wrote before, this is not clear to me. 16. g5e6  16... f7e6  17. d5e3 Black's position looks a bit shaky with some potential weaknesses. 17... g7h6  18. a1d1  18... a8b8 Anticipating an exchange on c4, as the rook can now capture on b2. 19. d3c4 [%c_effect c4;square;c4;type;Inaccuracy;persistent;true] This move takes the game into a drawing line. Nepomniachtchi's decision is understandable, as each draw brings him closer to winning the match, but perhaps it was possible to press without too much risk with 19.Qe2. 19... a5c4  20. a2c4  20... b5c4  21. d2d6 Now a draw is inevitable. 21... d8d6  22. d1d6  22... h6e3  23. f2e3  23... f8f1  24. g1f1  24... b8b2  25. d6e6 