How good was Garry Kasparov?

Pretty good wouldn't you say?

One of my best students. (jk)

was?

He is the strongest living chess person on Earth

Strongest players in the world include Kasparov, Anand, and Carlsen (and also Aronian)

and Kramnik! as well as Ivanchuk maybe :P

And a lot more like Topalov,  Karjakin, Radjabov but they arent as good as Kasparov, Anand, and Carlsen. Those 3 are tops

 Ah yes, back in the days when computers were patzers. I remember when the easiest way to beat a computer was get it into an endgame where it sucked horribly, I suspect because queening a pawn was beyond the search horizon so it just shuffled pieces back and forth.

World Champion for 15 years, so i guess pretty good.

kinda mid ngl

With modern engines and preparation, Kasparov would likely still be elite, but Magnus Carlsen and others have raised the game with computer-assisted training. Still, at his peak, Kasparov was an unstoppable force, and many still consider him the GOAT.

among the greatest in recent history