> Also, IQ predicts chess performance as well: https://www.sciencedaily.com/releases/2016/09/160913124722.h...

"The study found that intelligence was linked to chess skill for the overall sample, but particularly among young chess players and those at lower levels of skill."

We might have different definitions of the word well.

Edit: Upon reading the linked study in the article, it's even worse than I thought:

https://www.sciencedirect.com/science/article/abs/pii/S01602...

"Effect sizes were small-to-medium in magnitude; variance in chess skill explained by cognitive ability was similar in magnitude for Gf (6%), Gsm (6%), Gs (6%), and Gc (5%), with an average of 6%. Full-scale IQ explained < 1% of the variance in chess skill."