I have a Chess app on my tablet that can be adjusted from a skill level of 1 - 25. How would a skill level of 25 rank among the world’s Chess players?
Poorly, for a tablet.
These are top players.
Wow! I stand corrected.
https://www.chess.com/terms/chess-engine
They are far better than I remember and they don’t require outside access to computing resources.
That is a good question. I do not know the answer.
The Stockfish chess engine is probably the most powerful in the world.
Stockfish finds moves that are so deep that skilled chess players know instantly that someone is using an engine.
Stockfish, in various forms, is bundled with some commercial brand name chess software. Also, several chess websites have Stockfish available.
Unfortunately, unless you know a lot about computers and software (I do not), you never really know how powerful any particular version of Stockfish is.