How many percent chess is about skill and how many about good luck?

95% skill, and 5% good luck. However all wishes "Good luck everybody". Ridiculous.

It is all skill and no luck: there are no dice in chess, own your own mistakes.
The "Good luck!" is inappropriate indeed.

Well, in theory a totally random chess player  that moves randomly could win Magnus Carlsen. The probability is near to zero, but is not zero. So there is "luck" element too.

Look this: https://www.petke.info/RndChess/ It is not ready yet, but already funny to watch.

Hmm in my opinion there are different cases:

 if         player 1 skill = player 2 skill

                     then  outcome = 100% luck 

 else       if player 1 skill > player 2 skill 

                      then outcome = 100% - (skill of player 1 - skill of player 2 )% luck 

But of course in reality there isn't just 1 variable called skill, there are so many different things that one can be good at. For example player 1 can be good at openings, player 2 at middlegames and player 3 at endgames. player 1 might have a better score against player 2. player 2 might have a better score against player 3. player 3 might have a better score against player 1, because the equation is different when we combine their skill levels

The “good luck” is just for sportsmanship. Don’t think too much about it.

Precisely.

It's your opponent's poor skill, so it's skill.

alguém pra jogar?

There is no ‘luck’ in chess… so 100% skill.

in short run 95% skill.  In long run 99% skill. 

[chess is a whole lot more than tactical]