They got the second word wrong, I got it right, but still scored against me. Haha.

Impartial does not mean "treating all parties equally". It means "uninterested in the results". Fair would be "treating all equally". That's why there's a phrase "fair and impartial". "Partial" of course, doesn't mean "unfair", so negating it can't turn it into "fair". Partial means to favor one side or the other.

This is why when people tell me I'm wrong, so often I feel smarter than they are. HN quizzes are conditioning me for some antisocial attitudes, I think.