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 