B♭7♭9 8-string guitar chord

How to play B♭7♭9 on 8-string guitar

The most common way, the first shape above: your index finger on the A string at the 1st fret, your middle finger on the G string at the 1st fret and your ring finger on the high E string at the 1st fret. Let the D and high B strings ring open. Don’t play the F♯, low B and low E strings.

From the F♯ string x x x 1 0 1 0 1 (x: not played, 0: open)

What notes are in B♭7♭9?

B♭7♭9, B♭ dominant seventh flat nine, is B♭, D, F, A♭ and C♭: the root (B♭), the major third (D), the perfect fifth (F), the minor seventh (A♭) and the flat ninth (C♭). Its formula is 1 3 5 ♭7 ♭9.