You're confusing reading AR to reading bpm. If you see a 290bpm AR10 map, it's most likely that you're having trouble planning ahead on the speed of objects that come out on 270bpm and not having trouble with the AR.
If you want to know if you can read AR10, just pick a random ranked map that you already FC'd, go into edit, change the AR to 10, see if it's still equally easy to FC for you.
(at the same time, that 290bpm AR10 map you had trouble reading will still be hard for you to read in any lower AR. In fact it will be even harder to read like that)
If you want to know if you can read AR10, just pick a random ranked map that you already FC'd, go into edit, change the AR to 10, see if it's still equally easy to FC for you.
(at the same time, that 290bpm AR10 map you had trouble reading will still be hard for you to read in any lower AR. In fact it will be even harder to read like that)