Humans use heuristics. The outcome of a game of chess is not entirely dependent on skill. Chess is as lucky as anything else humans do. Debate after that is just semantics, and isn't worth talking about.
Ideally this topic would be about shocking very new players with the idea that a game like chess has an element of luck. Instead it's devolved into this junk.
For the record, a dictionary that defines luck as "fortune" isn't a dictionary, it's a thesaurus.
Which just illustrates the point that picking out one dictionary definition from the many that exist and proclaiming that that is the one "true" meaning that everyone in this forum must acknowledge is asinine.
Quite the contrary.
When we want to delve into precise meanings of words, a generalized dictionary isn’t enough. When discussing luck, we should look for the precision of the mathematicians who specialize in such events. Those mathematicians are called “statisticians”.
I have already posted a definition used by statisticians.