Russian chess master Anatoly Yevgenyevich Karpov ranked from 1975 as world champion to 1985.
Garry Kasparov defeated this official grand doctor. From 1986, he played three matches against Kasparov for the title to 1990. After Kasparove broke away from Fédération Internationale des Échecs in 1993, he then held its title once again. He held the title but in protest against new rules resigned in 1999. Many consider Karpov of the greatest players of all time for his decades-long standing among the elite.
I don't think I've ever been more disappointed by a chess book. Here I was thinking a world champion was going to reveal secrets and instead, it is a nothing book. Don't just take my word for it. Tony Miles had a bemused rant about it in Kingpin in 1986, you can see it here.
Note in the link the different cover and title. That is the one I bought, Learn From Your Defeats. Even that was a scam of a title. Will you learn 'How to' learn from your defeats? Not a chance.