John A Swartz wrote (to 'Banana'):
So "Banana", if you claim that the U.S. has no authority over Fischer
while he's not in the U.S., I submit to you that Bobby's "renunciation"
of his citizenship has no authority since he did it in Japan.

On the contrary, Bobby Fischer was supposed to be outside the United States
in order to make a formal renunciation of his United States citizenship.
According to the United States's Immigration and Nationality Act of 1952,
the oath of renunciation must be signed in the presence of a United States
diplomatic representative by someone (the intended ex-US citizen) outside
the United States, except possibly during a time of war.

--Nick