I already read that. It works so you only have one " - " between the author and title if there is no series, but I tried all sorts and could not get it to work with brackets in it.
Edit: After re-reading it 4 more time and another 8 attempts, I finally got it to work.
Code:
{authors} {series:| - [|} {series_index:||]} {title:| - |}
I'm sure it could me made easier to understand.