Deep Blue stopped playing chess just after crushing Garry Kasparov. It had been dismantled decades ago.
Garry Kasparov stopped playing chess 8 years after losing to Deep Blue. He was not dismantled, he only focused his brain on other tasks.
After a long break, a blitz event organised as an extension of US Championship brought together the legendary WC of 80s and 90s and three leading US players, Caruana, Nakamura and So.
No doubt that it was a clever example of show business to increase public interest to chess in US considering that how strong GK can resist creates a magic dilemma about the outcome of such event.
In the end, GK not only showed a brilliant performance against three players from World's Top-10 ranking but he also demonstrated tactical players keep their playing level high much longer than positional players.
Now if GK decides to return to active chess playing, i'm sure that he will not regret. Even though he could not win that blitz tournament, all his games were attractive and addictive.
Just imagine what more he could deliver with more preparation...