The Old Tricks #4: Ivanchuk vs Alekhine's

This time I have one more little known Ivanchuk game - with my annоtations as they appeared in Chess Today in 2011 (yes, computers are getting very strong, and analysis can be improved pretty easily, if one takes a closer look).
But, the puzzle first.

Shahovy novely Vasylya Ivanchuka. Nadstyr'ya (Lutsk) 2006, 156 pages, Ukrainian language