I don't think there's anything such as a lucky shot. Fists are thrown with the intention of hitting someone's chin. If you can finish your opponent it sends a clear message.
Yes and no. As mentioned before, having a shotgun or machine gun strategy of overwhelming an opponent isn't lucky if its done in the right way against the right opponent.
HOWEVER, simply having the intention of doing something and then doing it, doesn't mean it wasn't lucky, I can say, I intend to score a half court shot facing away from the basket and actually do it, but does it mean I wasn't lucky?
Intention has no inherent connection with luck.