Bobby Fischer
Speculation on psychological condition

While as far as is known Fischer was never formally diagnosed with a mental disorder, there has been widespread comment and speculation concerning his psychological condition based on his extreme views and unusual behavior. Reuben Fine, psychologist and chess player, who met Fischer many times, said that "Some of Bobby's behavior is so strange, unpredictable, odd and bizarre that even his most ardent apologists have had a hard time explaining what makes him tick" and described him as "a troubled human being" with "obvious personal problems".

Valery Krylov, advisor to Anatoly Karpov and a specialist in the "psycho-physiological rehabilitation of sportsmen", believed Fischer had schizophrenia. Psychologist Joseph G. Ponterotto, from secondhand sources, concludes that "Bobby did not meet all the necessary criteria to reach diagnoses of schizophrenia or Asperger syndrome. The evidence is stronger for paranoid personality disorder." Magnús Skúlason, a chess player, psychiatrist and head doctor of Sogn Institution for Mentally Ill Offenders near Selfoss, befriended Fischer towards the end of Fischer's life. From Endgame, Fischer's 2011 biography by Frank Brady:

Skulason was not "Bobby's psychiatrist", as has been implied in the general press, nor did he offer Bobby any analysis or psychotherapy. He was at Bobby's bedside as a friend, to try to do anything he could for him. Because of his training, however, he couldn't fail to take note of Bobby's mental condition. "He definitely was not schizophrenic", Skulason said. "He had problems, possibly certain childhood traumas that had affected him. He was misunderstood. Underneath I think he was a caring sensitive person."
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