Not totally sure, just my impression.
13...Bb7
Ok sure, on a6 it's optically a better diagonal... but white is never going to play Nd6 and just let it trade good for bad bishop (at least not right away), the knight will sit there and perpetually cramp black.
Also a6 itself is loose. Both a knight discovery and an eventual a5 make the bishop subject to tactical ideas. And somewhat c6 is loose, white is obviously looking to pressure this only open file on the side of the board where he has more space.
And as for space, I would have played it with the idea of 14...a6 or 14...a5 in mind, but apparently Nimzo didn't agree.
22...Rb8
This one I'm not sure. I think he might have seen Alekhine's idea of trippling on the c file then winning the pinned knight with Ba4 and b5, so Rab8 allows black to play b5, after white's Ba4. Maybe it's still bad for black, but at least white can't do that pin it and attack it with a pawn idea.
Either that or it's some kind of waiting move? (it's hard to find a move for black here).
23.Qe3
The only good thing I can say about Qe3 is it's on an open rank i.e. he's keeping ideas of kingside pressure in the air. Now as he plays Rc3 and Rc2 black additionally has to keep in mind a knigside shift. Alekhine may have considered this to be a technically superior method to finish off his tied up opponent (?) Then after the 25th move, he made his final decision and played Qc1.
Hello, I've just bought Alekhine's book "My best games.." and in the game mentioned in the title I've got some doubts.
Here's the game, with variations given by Alekhine and other given by me:
Although Alekhine's notes are great, I think he should have commented more moves, for example, why did black played 13..Bb7 and 22...Rb8 ? And why did Alekhine himself played 23.Qe3 ? I made this post principally for these questions, but, if you want, you can also add some more notes and variatons, to enrich the game.
Thank you in advance.