At the end of the day Kostenuik decided to swap the rook pair.  The tactical ideas fizzled out, and the rooks are no better than the  opponent's ones.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6 According to the Megabase, this is the  first time that the world champion uses the Berlin Defense. This might,  however, have been on the cards in her match against GM Aleksandra  Goryachkina. 4. e1g1  4... f6e4  5. d2d4  5... e4d6  6. b5c6  6... d7c6  7. d4e5  7... d6f5  8. d1d8  8... e8d8  9. f1d1  9... d8e8  10. b1c3  10... c8d7  11. b2b3  11... f8e7  12. c1b2  12... a8d8  13. c3e4 An attempt to improve on a game that  was played at the Russian team championship. 13... h7h5  14. d1d2  14... d7c8  15. d2e2 Kostenuik decided to keep as many pieces  as she can on the board. On the e-file the rook aims the black king. 15... c6c5  16. a1e1  16... h8h6 Ju finds a nice way to bring the second rook  out. 17. c2c4  17... e8f8 