Sometimes funky music requires knowing very atypical chords, in comparison to rock or pop music. A celebre Stevie Wonder song (Superstition), as an examples, contains (if you want to play it in a funky flavour) Bbmaj13(#11) chord.
I found on the web this shape for that chord:
but it's a little bit hard for me to understand how to rebuild it, for example, from a standard shape of Bbmaj. Is there a general easy rule which help a guitar player to construct such a chord?