That's an "easy" puzzle for Garry!

I just saw this in my YouTube recommended too lol. Amazing how even @Hikaru seems impressed
I'm pretty sure Kasparov probably saw this study before, but even so - the memory, calculation and notation speed is incredible if nothing else.
Plus, Kasparov is known to be incredibly good with endgame puzzles like these. GM Maurice Ashley once spent a few days creating what he thought would be a "difficult" endgame puzzle...Kasparov solved it in about 10 minutes...over the phone! That is how the story goes anyway, but after seeing this clip; I wouldn't be surprised!