What % of brilliant is a ?

How did this even happen?

It could have a brilliant move in it

That’s what it means

It seems like you don't know if it was you or your opponent who made the brilliant move, and you're forced to analyze the game to find out.

on fast engine i got no brilliant, but on standard i got one

the three reactions it shows you are only for you, not your opponent

Yes, except when it's a brilliant move

good to know, thanks!

i ended up with half a brilliant, i guess