Played tournament chess in college, a very, very long time ago. Was USCF rated, not very high. I think I got up to B level. Won some money and a trophy for the biggest upset in the 1974 San Bernardino Open. I beat an 'expert' rated player when I was still a C.
The expert was a kid about 14 years old!
Now I'm teaching chess to my grandson. Only because he wants me to. I started him with the K-P vs K end games so he will understand opposition.