John F. Rizzo is an expert on losing. However, if you want to win, you would do better to seek advice from an expert on winning.
David Sirlin is such an expert, a renowned Street Fighter player and game designer. He wrote a series of articles with the title "Playing to Win", about playing competitive games at a high level, which were so popular that he expanded them into a book. You can either read it for free online (donations are appreciated) or purchase a dead tree edition.
Any further summary would simply be redundant when you could simply read Sirlin's own words, so here is the link:
http://www.sirlin.net/ptw
If losing is the perfect opposite of winning, studying how not to lose is roughly equivalent to studying how to win. My personal experience dictates that if I am losing a lot and do not know why I will learn more from studying my losses. Once I know what the problems are I can study how other people win in those circumstances.
Except that Rizzo was focusing on some kind of psychological "need to lose". When I go back and study my winning and losing backgammon games, my psychology isn't the focus. I look for situations where, in retrospect, a better choice could have been made and then look to see if there was enough information in context to have enabled me to take that choice. I also sometimes catch situations where I wasn't paying enough attention, and missed a move that I think I would have chosen if I had noticed it.