B♭7♭5 8-string bass chord

How to play B♭7♭5 on 8-string bass

The most common way, the first shape above: your index finger on the A string at the 1st fret, your ring finger on the D string at the 2nd fret, your middle finger on the G string at the 1st fret and your little finger on the C string at the 2nd fret. Don’t play the F♯, B, E and F strings.

From the F♯ string x x x 1 2 1 2 x (x: not played, 0: open)

What notes are in B♭7♭5?

B♭7♭5, B♭ dominant seventh flat five, is B♭, D, F♭ and A♭: the root (B♭), the major third (D), the diminished fifth (F♭) and the minor seventh (A♭). Its formula is 1 3 ♭5 ♭7.