[%c_effect e4;square;e4;type;Inaccuracy;persistent;true]
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... e7e5 This is only the ninth most popular choice for Black against the Rossolimo. 4. e1g1  4... f8d6  5. c2c3  5... a7a6  6. b5a4  6... b7b5  7. a4b3  7... c5c4  8. b3c2  8... g8f6  9. d2d4  9... c4d3  10. d1d3  10... d6e7  11. f1d1  11... d7d6  12. c1g5  12... f6h5 The players are following their own theory. All of this had been tried in the first tiebreak game. It's worth mentioning that So has an opening course in which he recommends the Rossolimo. The move 12...Nh5 is not mentioned in the course; only 12...0-0 is analyzed. 13. g5e3  13... e8g8  14. b1d2  14... a8b8  15. b2b4 [%c_effect b4;square;b4;type;Interesting;persistent;true] The idea is to play a4 without Black being able to respond with b4. 15... g8h8 [%c_effect h8;square;h8;type;GreatFind;persistent;true] Nakamura prepares his counterplay with the move f7-f5. 16. c2b3  16... d8c7  17. d2f1 [%c_effect f1;square;f1;type;Inaccuracy;persistent;true] 17... f7f5 [%c_effect f5;square;f5;type;GreatFind;persistent;true] 18. f1g3 