ok i gave my 11 year old siSter my controller for a second. She flicked the thumbstick and no scoped a guy off a warthog from across the map in valhalla. She never playz halo either. Now is that luck?
Imagine a set of dominoes lined up so that knocking over domino "A" knocks over domino "Z". If you knock over domino A and domino Z falls over, you don't think "that was lucky", because you can physically see and understand the process, that knocking over A will result in Z falling too. Just because an event doesn't fall into your full understanding doesn't make it any less determinate on physical process than the dominoes.
I was using dominoes (the tiles from the game "Dominoes") as an example of fixed contructs that created a reaction based on a chain of occurences. Basically using the reaction between dominoes as a metaphor for the reaction between atoms/ electrons on a molecular level.
Consider luck as a vacuum; it is all of the empty space that isn't occupied by things you are in control of. The more aspects of the situation you have control of, the less space there is for luck, and the less you must depend on it.
It depends on how you look at it. If you were to win $1,000,000, you would be considered "lucky". However, I don't think that "destiny" luck is true. Like, I don't think that it is already determined that you will pick a certain thing out of a hat. To me, luck is just another term for good fortune.