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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: