parmetd: This game won the game of the day prize for round 9.
14. Ba4 is the N it was prepared some time ago as an improvement over his 2nd's game I Cheparinov vs Vallejo-Pons:I Cheparinov vs Vallejo-Pons, 2008, 2008 but Topalov said he was quickly out of book (move 20 which is also where he took his first think on Kh1) as he was not expecting this line and did not review his concrete analysis. According to Topalov, the losing move was 14... b5?? (the?s was Topalov's not mine).
He thought 20 Rb1 might also be good but he didn't like Qxd4 and thought white might almost be losing here.
He thought after Kh1 black's whole setup was dubious and probably lost because of the a2 pawn. He said this line was previously and should again be considered dubious.
Topalov thought 22. f6 was fine.
Topalov had an interesting comment that on the normal move 14. Bxd7+ Bxd7 15. Rxb7 (a position that had icc GM commentators Joel Benjamin and Ronen stumped as preferable for white) that black should equalize with Qh4+ 16. g3 Qd8