1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3  5... f8c5  6. c2c3  6... b7b5  7. a4b3  7... d7d6  8. c1g5 This is a treacherous move. White invites the opponent to play the classic plan with h6-g5, leading to a sharp position. 8... h7h6  9. g5h4  9... c8d7 A rare choice. Two of the best chess players in the world decided to move the dark-squared bishop in this position, but they played it on different squares. 10. b1d2  10... d8e7  11. e1g1  11... g7g5  12. h4g3  12... c5b6 A new move, although the bishop retreat is necessary sooner or later. 13. a2a4 A typical move in the Spanish, opening the a-file. 13... a8b8  14. a4b5  14... a6b5  15. f1e1 These positions are difficult to play for both sides. Here, for example, Black has a dilemma: should he advance the kingside or castle $2 Apparently we have yet another case of the \"when in doubt, just castle\" principle. 15... h6h5 [%c_effect h5;square;h5;type;Inaccuracy;persistent;true] 16. h2h4  16... g5g4  17. f3h2 [%c_effect h2;square;h2;type;GreatFind;persistent;true] The right square. Sometimes you have to go back before going forward. 17... f6h7 [%c_effect h7;square;h7;type;Inaccuracy;persistent;true] 18. h2f1  18... h7f8  19. f1e3  19... b6e3  20. f2e3 [%c_effect e3;square;e3;type;GreatFind;persistent;true] Reinforcing the center and opening the f-column. 20... f8g6 