I'll try to get through once again.... If the accidental incidences that you refer to, are luck in chess-
Then anything deliberate that you constrast that with, is ability in chess.
It is as simple as that.
Nonsense. Not everything that happens to chess players during a game must be either luck or chess skill. Just another senseless arbitrary "rule" that you have invented. A player physically restraining another, turning in a scoresheet with a false winner circled, getting caught using a smartphone, or any rules violation is patently NOT chess skill on the part of the opponent who will receive the benefit of a win when the offender is penalized. Nor is it luck--remember that every definition of luck I have furnished explicitly states that luck has nothing to do with a person's own efforts/abilities. All these things you mistakenly claim I believe to be luck are the result of the other player's poor choice of attempted winning strategies. The opponent's attempts are no different (in deciding the winner/loser) than their overlooking your back-rank mate. When a player adopts a losing strategy or tactic, the unfavorable result is of their own making.
On the other hand, should you be suffering a royal butt-kicking otb when your opponent's spouse storms into the tournament hall, yells at and berates them before pulling out a pistol and shooting them, then you did luck out.
In practice, when I'm playing well, I virtually never choose more than five candidate moves. Time is limited and my thinking is that if I haven't chosen the best candidate move among the five then I'm not playing well at all. It's best to make the positive assumption and not throw good money after bad.
Then I usually assume that two moves can be eliminated quite quickly on a simplistic positional or tactical basis. I choose the two least likely moves to start with and proceed til I've eliminated two. Then I look more carefully for reasons to eliminate a third and when I have two, if there's time and the position is critical, I take my time and maybe devote five minutes to each move. I normally play quite fast and may have built up a resevoir of extra time, which I am now trying to convert into positional and tactical threats. There are occasions when the two remaining candidates seem about equal in value but are strikingly different from one-another. One might be tactical and the other positional. So that's when a game overview is necessary. Which is most likely to win if both are equal? Sometimes the evaluation is so equal that I have to guess which is better. On a strategic basis, which seems to give the higher percentage of winning chances?