After absorbing every single move of any variation in the book, and having nothing more to explore, Dr B begins to play the game against himself, developing the ability to separate his psyche into two personas: I (White) and I (Black). This psychological conflict causes him to ultimately suffer a breakdown, after which he eventually awakens in a sanatorium. Being saved by a sympathetic physician, who attests his insanity to keep him from being imprisoned again by the Nazis, he is finally set free.