Regarding the list:
I'm not aware of a single indication that George Washington even knew how to play chess whereas Josip Broz Tito, who was well-noted as a chess player isn't mentioned. It mentions Bono, but not Sonny Bono.
This is a proof he didn't play chess. She would knew it
@Batgirl, good point -- owning a chess set does not prove that a person played chess. And as you mention, even his ownership of a chess set is in doubt.
I have no doubt that you know much more chess history than me. So if you doubt that Washington played chess, then so do I. I don't remember where I got that list (maybe Wikipedia); not sure how reliable it is.