Alekhine produced lots of amazing tactical attacking games but he was also a master of endgame play, and positional understanding. For Alekhine, the attack needed to come from the position and if he sacrificed it was his ability in assessing how much compensation he would get that usually made these work. Alekhine is a great player to study if you are an attacking player yourself. If you have trouble with attacks or advanced tactics and combination, then Alekhine is also good to study as you will definitely learn from his games and ideas.
There are some attacks by Alekhine now for members of the Training Squad to look at, but take a look at this combination and see if you can work out what Alekhine as black played?