Bdim7 6-string bass chord

How to play Bdim7 on 6-string bass

The most common way, the first shape above: your index finger on the E string at the 1st fret, your ring finger on the A 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. Let the B and D strings ring open.

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

What notes are in Bdim7?

Bdim7, B diminished seventh, is B, D, F and A♭: the root (B), the minor third (D), the diminished fifth (F) and the diminished seventh (A♭). Its formula is 1 ♭3 ♭5 ♭♭7.

Why do four diminished seventh chords have the same notes?

A diminished seventh is minor thirds stacked all the way round, B, D, F and A♭, so Bdim7 has the same notes as the diminished sevenths on D, F and A♭. Any of its notes can be the root.