A win is a win, so why are you trying to downplay your latest accomplishment? Don’t be modest just because you want to impress someone. It’s a waste of time to hide your abilities, and this particular person is way too smart. They’ll be able to see right through your act in a minute. Just be genuine and be happy! You have every right to be proud of yourself. If you’re worried other people will get jealous, that’s their mistake to make. You can’t help them.