Murky: Mamedyarov here at his tactical best. 23. Ne6+ fxe6 24. Rd7+ looks tempting, but Mamedyarov has better. 23. Bxf7!! draws Kasimdzhanov into mind-boggling complications. After 23... Kxf7 24. Ne2 reasonable candidate squares for the queen include b8, c7, h6, f5. 24... Qb8 loses to 25. Ng5+ Ke7 (25...Kg7 26. Rd7+) 26. Ng3 and black is defenceless.
24... Qc7 25. Ng5+ Ke7, and the quiet move 26. Nf4 opens the e file for the rook. 26... Be4 (what else?) 27. Nxe4 Qxf4 28. Nxf6 Qxf6 29. Rd7+ wins.
24... Qh6 25. Ne5+ and now
* 25... Ke7 26. Qc3 (attacking the c5 bishop) 26... Rhc8 and now 27. Qb3 double attacks the bishop on b7 and the f7 square.
* 25... Ke6 26. Re1!! and the black king is trapped. 26... Bd5 27. Nd4+ wins. 26. Be4 27. Ng3 wins. If 26... Rhd8 27. Nc3 or Ng3 wins. 26... Ne4 27. Ne4+ Bxd4 28. Qxd4 wins. What a thicket of complications!
24... Qf5 (actually played and best) 25. Ng3 Qf4 (25... Qc8 loses to 26. Ne5+ Kg7 27. Nd7 and now 27... Be7 28 Re1 wins. Or 27... Qc6 threatening mate on g2, but 28. Nf5+! wins) 26 Ne5+ Ke6?!
(26... Kg7 is better, 27. Nd7 Be7 28. Rd4! and if 28... Qc7 29. Rc1 is an easy win, but 28... Qxd4 29. Qxd4 Rhd8 30. Re1! Rxd7 31. Qxd7 Nxd7 32. Rxe7+ Kg8 33. Rxd7 and white is merely a pawn up in an endgame. Black's best chance.)
Game continued 27. Qa2+ Bd5 (if 27... Kxe5 28. Re1+ and now if 28... Be4 29. Rxe4+ Bxe4 30. Qd5+ Kf6 31. Nxe4+ Kg7 32. Qb7+ Qf7 33. Rd7 wins, or 28... Ne4 29. Qb2+ Ke6 30. Rf3 Rhf8 31. Qc2 wins) 28. Rxd5! Nxd5 29. Nd3 Qd4 30. Ne2! Qg4 (29... Qc7 is less catastrophic) 31. Nef4+ Kf6 32. Nxd5+ 1-0
The tactics here require great depth of calculation, and Mamedyarov had to pick through almost all of it with accuracy. It's even hard to fathom the tactics with the aid of a computer. Computer analysis done with Hiarcs software on an Imac computer.