1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6  4. d2d3  4... f8c5  5. e1g1  5... c6d4  6. f3d4  6... c5d4  7. c2c3  7... d4b6  8. b1a3  8... c7c6  9. b5a4  9... d7d6  10. a4c2 So has experience in that position with both colors, but the Berlin is tough to break, and he won't achieve much in the opening. 10... c8e6  11. d1e2  11... h7h6 [%c_effect h6;square;h6;type;Interesting;persistent;true] Avoiding the pin with Bg5. 12. a3c4 This natural move is a novelty. 12... b6c7  13. f2f4  13... e5f4  14. c1f4  14... e6c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] Clearly the best move, as Black disrupts White's pawn structure. 15. d3c4  15... d8e7 Considering that soon Black will have an excellent position, it's time for the opening experts to start looking for an improvement. 16. a1d1  16... e8c8  17. g1h1  17... h8e8  18. f1e1  18... c8b8 Here and in the next moves, taking the knight to e5 is also a position with comfortable play. 19. e2f3  19... g7g5 