I have recently learned that former chess world champion Tigran Petrosian earned a PhD title from Yerevan State University; the title of his dissertation title was Chess Logic.
I would like to read what he wrote. I can read Russian. Any idea how to get hold of this text?
EDIT: I have just read in a chess history book that between his two matches with Spassky, Petrosian worked on the philosophy of the chess battle, studied the secrets of the process of chess thinking, successfully defended a dissertation on this subject and became a candidate of philosophical sciences - my translation from Russian. This cryptic text does not mention the title of doctor (PhD) but an obscure title of candidate.