[%c_effect d2;square;d2;type;Mistake;persistent;true] Now it becomes ugly for White.
1. d2d4  1... d7d5  2. c2c4  2... c7c5 [%c_effect c5;square;c5;type;Interesting;persistent;true][%cal dc7c5][%c_arrow c7c5;keyPressed;none;from;c7;opacity;0.8;to;c5;persistent;false] Nakamura has played this provocative move other times. 3. c4d5  3... g8f6 A rare move that is new to Nakamura's practice. Previously he had captured on d5 immediately with the queen. The game, however, will soon transpose to a more conventional position. 4. b1c3 Ding decides not to get into a discussion about the validity of Black's defense; otherwise, he would have to play one of the alternatives. 4... f6d5  5. g1f3 This is a well-known position of opening theory. 5... c5d4 Another move that is not played often. 6. d1d4  6... d5c3  7. d4c3  7... b8c6  8. e2e4  8... a7a6 The idea of this move is to prevent the bishop from going to b5. 9. f1e2 White has other options, and he probably should have chosen one of them, here or on the next move, since he is not getting an advantage in the game. 9... e7e5  10. a2a3  10... c8g4 A new move. 11. e1g1  11... a8c8  12. c3b3 [%c_effect b3;square;b3;type;Inaccuracy;persistent;true] Not a good square for the queen, since it can be attacked by Black's knight. There are three better alternatives. 12... c6a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] The queen doesn't have a good square. 13. b3a4  13... b7b5  14. a4d1  14... d8d1  15. f1d1 [%c_effect d1;square;d1;type;Inaccuracy;persistent;true] 15... a5b3 [%c_effect b3;square;b3;type;GreatFind;persistent;true] 16. a1b1  16... f8c5  17. g1f1 Ding continues to play passively. Unfortunately, this is a mark of his play when in bad form. 17... f7f6  18. d1d3  18... g4e6 