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 