By the way, I have read excellent Bjelica's book collection "The Kings of
Chess".
I have looked at the book, number 4, about Alekhine and I found the letter
of Dr. Antonio Ferreira in it (page 36-38).
Dr Antonio Ferreira was the student of medicine in Lisbon and he was present
on Alekhine's autopsy (in medical school where the body was transported).
They examined if he was poisoned, so they tested, carefully his stomach.
They didn't find anything. After that they tested if it was heart attack,
but they found the prosaic reason for death-a piece of steak in his throath.
They found two pieces, a big one in the throat and small in the mouth.

In the book was written that he analyzed (or intended to analyze)
Medina-Rico game, from the Spanish Championship, 1945.

On page 15. the readers can see that last Alekhine's photo: Alekhine's dead
body with white pieces in front of him.
Maybe it would never be revealed who played with black...

Regards,
Goran Tomic