Bycotron: Move 30, white to play.
The key element of the position is the white d6 pawn, passed and advanced clear to the 6th rank already! What a brave and noble warrior.Black immediately threatens Rxa4 and this can buy him time to play Rfd8 and kill the d6 pawn if white doesn't play with fire and fury immediately.
The most obvious move needs to be looked at first:
30.Nxc5
Not a true piece sacrifice. This removes the guard of the b4 Rook, buying time for white AND removes the Queen's guard of the d7 square so white can win the c8 Bishop by the d6-d7 push. However, simply playing these ideas immediately like a caveman in insufficient as it will simply exchange a pawn and minor piece each and leave black with a passed e-pawn in an unclear position. White will likely lose a long struggle.
So how about...
30...Qxc5 (forced)
31.Rd5! pointing out the Queen's lack of squares to defend the b4 Rook while improving white's position.
31...Qb6 (again forced)
Now black would like to play Bd7 and blockade the d6 pawn. After the immediate 32.d7 Bxd7 33.Rxd7 Rxb2 I'm not sure what's going on, so white needs a better idea for move 32.
32.c5 is the most logical continuation for white, continuing his policy of improving his position as much as possible and forcing black's replies!
32...Qb7 looks like the most critical reply, hitting the undefended d5 Rook and planning Bd7 to keep the extra piece while preventing white from making the immediate d7 push. Hmm, white needs a miracle now!
33.Bxa6 won't do. 33...Qxd5 34.Qxb4 Bxa6 0-1
Maybe this would be easier if I set the position up and moved the pieces around, but I always solve these puzzles by mental visualization only, just as if I were playing the game. I actually can't find any good continuation for white leading to an immediate advantage in the line I suggested.
The other obvious move that comes to mind from the puzzle position is:
30.d7 Bxd7
31.Nxc5 Qxc5
32.Rxd7 (or 32.Rd5 Qb7 33.Rxd7 Qxd7 34.Qxb4)
And we arrive as the same unclear position that can come from 30.Nxc5 in my previous analysis. Unfortunately, this move order allows black the possibility of 30...Rxa4 which may lead to the following:
31.Qxa4 Qxa4
32.d8=Q Rxd8
33.Rxd8+ Kf7
34.Rxc8 with an interesting, unclear position on white's 2 Rooks vs black's Queen and pawn.
Long story short, I see no way for white to obtain an obviously winning position from today's puzzle.
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In my analysis of the position, I thought 32...Qb8 made white's life incredibly easy for exactly the reasons Javakhishvili demonstrated. I dismissed it with analysis I found in ~10 seconds of thought so I didn't even include it in my post.
Is my suggested move, 32...Qb7 an improvement for black? Can white still win after that move?
Kibitzing
sac: 30.Nxc5
) wins for Black after 24... Qh4! 25. Bg3 Qh6 26. h3 f4! 27. Bf2 Qg6 28. Kh2 f3! 29. g3 Bc8! 30. Nb5 Qh6 31. Re4 Ng4+ 32. Rxg4 Bxg4 
(-7.01 @ 21 depth).
) 32. Rxd7 e4 33. Red1! f4 34. Rb7 a5 35. Rdd7! Bh8 36. Rb5! Rxb5 37. cxb5 Bd4 38. Qa4 Bg7 39. Qxe4 Kh8 40. b3 Qe3 41. Qd3 Qc5 42. Rd8 h6 43. Qd7 f3 44. g3 Qc1 45. Qd3 Rxd8 46. Qxd8+ Kh7 47. Qd3+ Kg8 48. b6 