CHICAGO — Now in its second decade ... enamored with chess, he got an idea — put Dr. Korenman inside Cook County Jail to teach inmates. “This is about trying to change people’s mindset ...

On a side street, in a cafe above an office, more than 70 young people are playing chess, to a thumping DJ ... is a mix of personalities. Some just turn up, play, and leave. Others see it as ...