IQ can be reduced through maltreatment, but in general we don't know how to incr...

IQ can be reduced through maltreatment, but in general we don't know how to increase IQ. Higher IQ people are more likely to play chess, but playing chess does not raise IQ. So just play the games you enjoy.

"Most people think playing chess makes you 'smarter', but the evidence isn't clear on that" https://phys.org/news/2019-07-people-chess-smarter-evidence-... .