Macro Dice Roll not working?

Hi all, I'm trying to get this macro to work: Roll 1d20, you succeed of a result of 13+rank-spell level or less. /roll 1d20<={13+@{selected|rank}-?{Spell Level}} Every time I test it though, it doesn't roll a dice and just gives me a result of '1'. In the screenshot below, you can see that the attack roll macro works fine, but the Psychic Fatigue roll does not.

The Less Than operator needs an integer to compare to, so you need to wrap the right hand side in [[ ]] roll brackets. Roll20 also uses < and > as "less than or equal to" and "greater than or equal to", so you don't need the = sign. So: /roll 1d20<[[13+@{selected|rank}-?{Spell Level}]] should work. Basically, it's expecting a die roll on the left and an integer on the right. There are some tricks to get around this limitation if needed.

Thanks Oosh, I'd never have figured that out on my own. I've never heard of a roll bracket before... The more I use Roll20, the more I feel like you need a degree in computer code.

I probably should have said " inline roll brackets ", just to avoid any confusion.