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I suspect the estimation of Pres. George W. Bush's IQ at 91 is about
right, perhaps even generous.  Sometimes, IQ tests yield results which
make one wonder how reasonable or accurate they may be.  After all, there
seems to be no way to definitively test IQ tests and educational
psychology is far from an exact science.

The estimated IQ of 135 for Gary Kasparov is some proof or indication of
how inaccurate IQ tests can be.  Anyone who has memorized an opening book
of appr. 2 million positions for chess, can reliably identify and execute
any part of it quickly and errorlessly and moreover, is one of the very
best in the world at intelligently improvising mid-game and endgame
scenarios without it is extremely intelligent (if not a genius or
borderline).

Yes, some highly intelligent people do not find standardized tests or
normal conversations (thru which their IQ can be revealed) especially
interesting, engaging or motivating.