[bunny]

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In that small subset of questions, high IQ will be a liability.

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I can't imagine a high IQ being a liability in practical terms. Maybe an absurd hypothetical like "in order to get the question right, you must fail to understand it," but in the real world - high IQ a liability?

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There were no constraints on Y in DS's scenario. I agree with you that a high IQ is a good indicator of problem solving ability in general. I dont think it's right to annoint it as the be-all and end-all though - I suspect a category of (perhaps odd) questions exists which will deceive people who approach problems in the way that scoring highly on an IQ test requires - perhaps Y is one of those questions.