Why aren't smart people happier? IQ tests miss wisdom
Across 50 years of General Social Survey data from 30,346 people, higher vocabulary-test scores correlated with slightly lower happiness (r = -.06, p < .001). Intelligence tests measure well-defined problem-solving, but life's biggest questions—love, career, parenting—are poorly defined and require different skills like wisdom.
Life ain't chess! Nobody agrees on the rules, the pieces do whatever they want, and the board covers the whole globe, as well as the inside of your head and possibly several metaphysical planes as well.