I was following along with the Autumn Leaves from the Real Book and came upon the B7b9 chord.
My understanding is:
B: B D# F#
B7: B D# F# A
B7b9: B D# F# A C
Is that right? I've been using https://www.scales-chords.com to double check and it's really quite nice for the most part, except the B7b9 chord shows the same page as Bmaj7b9, which is a different chord than I showed above.
I need a sanity check, is this an error in the website, or am I constructing chords wrong?