It is something that makes a game so exciting that people actually want to name it immortal game
What classifies chess game as an immortal game?

It is immortal hours when you are a little god against evil. Your opponent throws at you traps and tricks and ironic moves. As you grow you can be evil or a trapper or a strategian of good principles

It's immortal because the king doesn't die and gets to go on to play in the next game unless you saw off his head and replace him like I do.

It's when chess writers like the game so much (or are too lazy to find new material) that they publish it again and again and again ...
Is it untakeable piece?
a deadly tactics?
Crushing attacks?