Especially with the modern variants in play in competitive games, such as en passant capture and the like. Many fairly enthusiastic chess players aren't exactly sure what all the rules are.
Not counting online games, I've played many 100s of games of chess with many dozens of people, mostly strangers, incl 12-year-olds (when I was 12) and not once did a dispute or difference of opinion arise about the legality of any move (incl en-passant moves).
What is the name of this strange country where players who are not just starting out don't know the rules of chess?
Here in the UK I have had to call a referee over during a tournament because my opponent didn't know about en passant. And it turned out said referee didn't know either (fortunately the other players backed me up).
What is the name of this strange country where players who are not just starting out don't know the rules of chess?