In my opinion, chess is the best game ever invented in human history. People have been playing this game for hundreds, if not thousands, of years, and games from the distant past can still be enjoyed by the modern generation of players.
To the best of my knowledge it is the most complex game ever invented which features no element of luck. Every victory is earned through a combination of your own play and your opponent's mistakes. It is a beautiful game.
It is also a game in which you can never be good enough. For example, I've been playing random non-rated games online recently (I don't play rated because it encourages too many players to cheat). For the last three days I've been cleaning house. I didn't lose a single game. My confidence was sky high when I began playing today.
So far, I've lost four times, including one game where I was beaten in eight moves. I've won six, but that's still not a particularly good record. It's so easy to make mistakes in chess that not even grandmasters consistently demonstrate perfect play. In fact, it's not even objectively known what constitutes perfect play in the first place. For years the most powerful engine has been Stockfish, which is the tool most often used to analyse games. However, Stockfish itself was thrashed by Google's AI, Alpha Zero.