He wrote chess books that included a well-regarded, deeply annotated collection of his best games, "Grandmaster of Chess" , "The Art of the Middle Game" (with Alexander Kotov) , and "Practical Chess Endings" . All three books are still considered among the best of their kind for aspiring masters and experts. He also wrote several tournament books, including an account of the 1948 World Championship Match Tournament. He authored several openings treatises, often in German: "Spanisch bis Französisch", "Dreispringer bis Konigsgambit" , and "Vierspringer bis Spanisch". He contributed to the first volume, 'C', of the first edition of the Yugoslav-published "Encyclopaedia of Chess Openings" ("ECO"), which appeared in 1974. Keres also co-founded the Riga magazine "Shakhmaty".