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It's called Les Joueurs d'Échecs rather than Le Joueur d'Échecs, so much so that the character of world champion Mirko Cventovic is not the only central figure. Master B. is just as central, and probably much more so.
The differences with previous translations are also due to other factors. These include the fact that the translator, Frank Renauld, is not only a Germanist but also a genuine chess enthusiast.