I can beat my mom and my friends. I'd probably suck against someone who plays chess as a hobby. I don't know if chess is an accurate litmus test. Being intelligent obviously helps a lot, it's a game that requires a lot of thinking, but I don't know how high the correlation is between, say, chess rating and IQ. Also, a major thing to consider is that, I think, you can get significantly better at chess with practice, so it would correlate a lot with one's interest in chess..