I'm actually from the UK. Is this the grade system people normally refer to - like they say they're grade 8? I meant more an algorithm to determine the difficu

I'm actually from the UK. Is this the grade system people normally refer to - like they say they're grade 8? I meant more an algorithm to determine the difficulty. Things like tempo and how much your fingers would need to move. But equally, I could probably just cherry pick some easier pieces far quicker