1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3  5... f8c5  6. c1g5 It seems there's much left to discover, even in such heavily studied openings like the Ruy Lopez. There are not many games in this position, and in a couple of moves, the game will leave theoretical territory. 6... h7h6  7. g5h4  7... d7d6  8. d3d4 [%c_effect d4;square;d4;type;GreatFind;persistent;true] A new one in this position. I'm not sure whether this was preparation or not, but it's the computer's first choice. White doesn't get an advantage, but it's a new position with a lot to play for. 8... e5d4  9. f3d4  9... c8d7  10. a4c6  10... b7c6  11. b1c3  11... e8g8  12. d1d3 [%c_effect d3;square;d3;type;GreatFind;persistent;true] Carlsen wants to send the king to the queenside to sharpen the game. This is more dangerous than castling short. 12... c5b4  13. d4e2 [%c_effect e2;square;e2;type;GreatFind;persistent;true] A necessary prophylactic move. 13... d8e7  14. e1c1  14... f8e8  15. f2f3  15... e7e5 On the board, we have a complicated middlegame fight with chances for both sides, which is not a bad situation for Carlsen. His next move, however, is a blunder. 16. a2a3 [%c_effect a3;square;a3;type;Mistake;persistent;true] White has a few options: 16... b4c3  17. d3c3  17... e5c3 [%c_effect c3;square;c3;type;Mistake;persistent;true] Keymer returns the favor. 18. e2c3 The position is more or less equal, but having realized that he was granted a second chance after his big mistake, Carlsen must have felt it was time to show his true chess. 18... f6h7 