I don't know brother, your question is very good and very difficult.
If you play heads-ups this is undoubtedly the same as a boxing ring. You have to turn your rival or he turns you.
If you play MTT or SNG it is nothing more than a tournament, comparable to any sport in which you want to win and others too. In general, the difference is that most of the time in sports the best man wins, whereas in poker someone can win as long as they are luckier than the opponent.
If you play cash, and well there it can be very comparable to what my friend AlphaCentauro says, it's a bit like Russian
roulette.
There is a saying that "in life you must help luck", I think something similar happens in poker. Many say "I was not lucky", really, you were not lucky??? or did you play badly? Many times in life it is said that I was not lucky, and in truth, if one analyzes the situation, it is very likely that I have done things wrong, and luck did not help. The same thing happens in poker.
I found German629's definition very nice and it is quite valuable. Tournaments often have a lot of roller coaster.
Well brother very good question and good post.
Cheers





