[%c_effect h5;square;h5;type;GreatFind;persistent;true][%c_highlight e4;keyPressed;none;opacity;0.8;square;e4;persistent;false] Black is preparing h5-h4 with an unpleasant attack on the e4-pawn. The opening was a success for Nakamura.
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... e7e5 Nakamura surprisingly repeats the risky experiment that guaranteed him a draw against Caruana in the Candidates Tournament—but did not yield a good position in the opening. 6. f1b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] 6... b8d7  7. d4f5  7... a7a6  8. b5e2 A new idea in this particular theoretical battle. 8... d7c5 The most natural square for the knight, although 8...Nb6 has also been played. 9. f5g3  9... b7b5 There are alternatives: 10. a2a3 A bit timid. 10... f8e7  11. e1g1  11... e8g8  12. c1e3  12... c8b7  13. e2f3  13... g7g6  14. d1d2 