1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. f2f3  6... e7e6  7. c1e3 An  interesting fact. The Najdorf was Topalov's bread and butter on the road  of the world championship title before switching to more quite lines,  whereas Vachier-Lagrave constantly uses the sharp Sicilian. 7... b7b5  8. d1d2  8... b8d7  9. g2g4  9... b5b4  10. c3e2  10... h7h6  11. e2f4 With this strange-looking move Topalov clearly  indicates his intentions. What else can the knight do on f4, if not  sacrifice itself on e6?! 11... c8b7 Tempting the queen to snatch a  free pawn, with a tempo. 12. d2b4 In the brief after-game interview Topalov said he studied the  position before and believed it to be promsing for him, but could not  remember the correct way. 12... d8c8 Besides the fork threat e6-e5 Black wants to strike in  the center with d6-d5. The b4 pawn was not sacrificed in vain. 13. b4d2 Probably not he best square for the queen. There are many options for both sides. 13... e6e5  14. d4f5  14... e5f4  15. e3f4  15... d7e5  16. f1e2  16... c8c7  17. e1c1  17... e8c8 The  forced sequence of moves is over. White practically sacrificed a pawn, but enoys the better pawn structure and the more active pieces in return. 18. c1b1  18... g7g6  19. f5e3  19... f8e7 