what’s the best feeling in chess?

An evergreen game. Can see first option as I liked a strategy that ends with a CM via a pawn.
But ultimately win or lose - you learned something is my understanding or opinion.

(a reply to a post about cheating in general and my opinion) I am not the player I was so normally play rapid, classical,or over some time in days. I am not a blitz bullet player anymore. If I detect cheating which can be the same amount of time for a move I have played safe and consolidated so there bot runs the clock down. Now I resign and they can have my points as I cannot possibly give them my time of day wasted opportunity that doesn't do them any good. Side issue about cheats. Playing a bent game is an insult to the lifes work putting in the knowledge.

Instinctively believing a sacrifice might work in a complicated position, but not exactly sure how or why... go for it anyway and everything works out.
Doesn't happen often, but when it does I'm in Zen.
Sometimes you play a bad sacrifice but your opponent still messes up. Makes me feel like a trickster

Finally beating an opponent who has till that point won every single game against you.
Also checkmating by accident. Like, you thought it was a good move, but not that good.

Clawing back from a lost position, one pawn and/or positional advantage at a time, and winning in the end game after a long and testing game.

I'll tell you what doesn't feel good. I'm about to win on my opponent's blunder. This is the highest rated player I've played and I wanted to win on my own merit not his mistakes. Otherwise, the 2nd or 3rd person made the right comment- …to hear the lamentations of the women.