A new idea in this particular theoretical battle.
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 