"Teachers nationwide are flummoxed by students’ newfound chess obsession/The fad, fueled by social media stars, has left teachers divided between displeasure and delight."

That's the headline at WaPo.

Why on earth would there be displeasure?

Some teachers have mixed feelings about the clandestine playing of chess in their classes....

Why wouldn't all teachers have unmixed negative feelings about the unauthorized playing of chess in class? 

Justine Wewers, a high school geography teacher... wishes her students would stop clicking to Chess.com on their Chromebooks and iPhones mid-lesson, as roughly one-third of her 150 ninth-graders... try to do each day...