[%c_effect c4;square;c4;type;GreatFind;persistent;true] The only way, otherwise the knight goes to f5 and White is too passive.
1. g1f3  1... d7d5  2. d2d4  2... g8f6  3. c1f4  3... c7c5  4. e2e3  4... e7e6  5. b1d2  5... d8b6 [%c_effect b6;square;b6;type;Interesting;persistent;true] An interesting way to meet the London System. 6. a1b1 Black won't have many problems in the game continuation, so maybe White should seek a more active way to play. 6... c5d4  7. e3d4  7... c8d7 [%c_effect d7;square;d7;type;GreatFind;persistent;true] A plan that is very typical in the French Defense. Black wants to exchange light-squared bishops. 8. f1e2  8... d7b5  9. e1g1  9... b5e2  10. d1e2  10... b8c6  11. c2c3  11... f8e7 Black has no problems, but White is solid. I think it's because of these types of positions that the London System has the reputation of being a dull opening. 12. f3e1 [%c_effect e1;square;e1;type;Interesting;persistent;true] The knight heads to d3. A slow maneuvering game starts. 12... e8g8  13. e1d3  13... a7a5 [%c_effect a5;square;a5;type;Interesting;persistent;true] Gaining space on the queenside. 14. a2a4  14... b6a6  15. f1e1  15... f8e8  16. h2h3  16... f6d7  17. d2f1  17... d7b6  18. b1a1  18... b6c4  19. b2b3 This gives Black a few targets to aim at. 19... c4b6  20. f1g3  20... b6d7  21. e1d1  21... g7g6  22. f4e3  22... e7d6  23. f2f4 [%c_effect f4;square;f4;type;Mistake;persistent;true] A very commital move. 23... d7f6  24. e3f2  24... a8c8 Black's position is easier to play now, but Nakamura is always resourceful. 25. a1c1  25... c6e7 