In regards to Korchnoi, it's as if they had script to follow. Like Fischer, Korchnoi was no fun to deal with. People liked to dismiss Fischer as a spoiled brat and Korchnoi as a chronic complainer because such superficial characterizations suited their purposes.
That 's a tedious (for a large quantity of games) but most worthwhile method of studying.
I rarely finish a book.
I employed this method with Logical Chess Move by Move, and dozens of partially completed books.
Prior to 2021, I had probably finished about six chess books cover-to-cover, but then I started buying Everyman ebooks in Chessbase format and read twelve chess books clear through in the first six months of the year. Some of that number were short Kindle texts for beginners (not Everyman) that I read so I could give them one-star reviews on Amazon. Most self-published Kindle books are horrid, but there are some gems—including a few of my own, and quite a few by Frank Erwich and by Carsten Hanson.
I read the whole of all of Capablanca’s books in 2021 except My Chess Career, which I started early this year. I also read Miguel Sánchez’s biography, Linder and Linder (not very good), and about 1/3 of Edward Winter’s compendium.
I’ve read all the text, but not all the chess annotations in both Korchnoi, Chess is My Life and Karpov, Chess is My Life.
I did finish the interviews. Some answers, particularly relating to Korchnoi, seem almost the same. Of course, Korchnoi was paranoid and a little crazy. But he had reasons; the KGB was out to get him.
As for the book, I am reading it as I do most tournament books. Slowly. I go through each game in ChessBase, usually a couple of times, then I go through again reading the annotations in the book.
In my just concluded weekly chess lesson with my top student, we went through Tal’s annotations to his round one game, and then raced through Karpov’s round two annotations.