1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6  4. e1g1  4... f6e4  5. f1e1  5... e4d6  6. f3e5  6... f8e7  7. b5f1  7... c6e5  8. e1e5  8... e8g8  9. d2d4  9... e7f6 One of the most solid lines in the Berlin.  White is trying to squeeze the tiniest of the advantages in a Petroff-like pawn structure. 10. e5e1  10... f8e8  11. c2c3  11... e8e1  12. d1e1  12... d6e8  13. a2a4  13... d7d5  14. a4a5 Since the pieces are far away from any clashes, Yu tries to gain some long-term advantages. Space, for instance. 14... e8d6  15. c1f4  15... c8f5  16. b1d2 