Interesting analysis - thanks smoeggi !
Although I find "Black's position is difficult, practically lost" a little bit exaggerated.
Alekhine proofed nicely that there is no reason to resign as long there is some life left in the position. I made the same experience with a number of "lost" games. A lot of opponents get impatient when they fail to convert a advantageous position into an easy win. Then there is a good chance to turn the tables.
Therefore never resign prematurely
I stumbled across this amazing save by Alekhine, and wanted to share it. Imagine playing black in this position - bad pawn-structure and uncoordinated pieces - against one of the most notorious endgameplayers in the history of the game: Capablanca. The comments following the moves are Mikhail Shereshevskys, from his book Endgame Strategy.