[Recursing]

There has been a lot of progress in computer chess software since 1997, the current version of Stockfish is very probably superhuman on a low-end smartphone

I can't find any recent experiment, but here https://en.chessbase.com/post/komodo-8-the-smartphone-vs-des... is a test done in 2014 that shows that smartphones were already clearly superhuman then

In 2019 I estimate we would need less than half of the computing power of that 2014 smartphone to achieve the same playing strength