Please don't devolve into reactionary nonsense. I'm pretty sure that if you measure the average IQ of good (whatever your definition of good) chess players, you won't get 100.
The first study of it I found (https://www.sciencedirect.com/science/article/abs/pii/S01602...) notes that, while there is some correlation, "Full-scale IQ explained < 1% of the variance in chess skill."