Little thought experiment

[Uri Blass]

On another world there exists a very powerful computer using alien tech.

This chess machine does a true (as in literal) Brute Force search 15 plies deep. It uses current SF E.F

How many plies deep, approximately, would normal SF have to search to equal the strength of the 15 plies alien machine?

Do you mean stockfish when you also disable extensions or extensions are the same as the extension of stockfish of today?

For the Stockfish engine: exactly as SF is today

For the Brute Force engine: SF EF but the search part is only BF with no extensions at all.
(Having said that another version with extensions would be interesting too)

If there is no qsearch then I expect the brute force engine to be very weak and
I guess stockfish with 15 plies with all the pruning that it has is probably going to win easily.