Can anyone explain why the area near the top-right is pink? Most of the other low proportions seem to be near borders, where people may perhaps identify as belonging to a former state that was absorbed into Russia. But this area has always been part of Russia, has it not?

Well I don't think any education system has you learning all 200+ flags of the world. And it's not like there's a real need to focus on the 32 World Cup teams.

Better, but I think flags + country name would be best. I'm a bit sketchy on my South American flags so I couldn't actually work out who played who.

But love the circle format too, never thought to use this for a knockout comp.