1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... f8c5  5. c2c3  5... a7a6  6. e1g1  6... c5a7  7. a2a4  7... e8g8  8. h2h3  8... d7d6  9. f1e1  9... h7h6  10. b1d2  10... c8e6 [%c_effect e6;square;e6;type;Interesting;persistent;true] This is an old idea that is making a comeback. In the beginning, players weren't afraid of getting their pawns doubled on the e-file. But later, playing Re8 (here or in similar positions) became the most reliable plan, with the idea to capture with the rook on e6. But the old idea is back in vogue and is being played in the most important tournaments. 11. c4e6  11... f7e6 To be honest, I think this position will appear to be comfortable for Black for most amateur players, as it's simply easier to play with the black pieces. Black dominates the f-file, can play Nh5-f4, and so on. Unfortunately, life is not easy for those at the top, so White can still pose some problems in elite games. 12. b2b4  12... c6e7 [%c_effect e7;square;e7;type;Interesting;persistent;true] An interesting idea, bringing the knight to the kingside. 13. d2f1  13... e7g6  14. a1a2 This is a classic prophylactic move in these positions, defending the f2-pawn and preparing to bring the rook into play. In his postgame interview, Keymer didn't seem convinced that this move was the most accurate. 14... d6d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] Fighting for central control. 15. f1g3  15... c7c6  16. a4a5 The first new move. 16... a8c8 [%c_effect c8;square;c8;type;GreatFind;persistent;true] The start of a nice plan to activate the rook. 17. c3c4  17... c8c7 [%c_effect c7;square;c7;type;GreatFind;persistent;true] 18. e4d5 [%c_effect d5;square;d5;type;Inaccuracy;persistent;true] This is a very difficult move to understand, as it improves Black's pawn structure. Of course, So knows this. He must have thought of some tactical reason that didn't work out in the game. The computer isn't as critical of this move, but what the machine can't see is what I call the \"human factor\": This move makes the position much harder for a human to play with White, even if the objective assessment points to equality. 18... e6d5  19. c4c5 [%c_effect c5;square;c5;type;Inaccuracy;persistent;true] 19... c7e7  20. g3f5  20... e7e6  21. f3d4 [%c_effect d4;square;d4;type;Mistake;persistent;true]