A♯dim7 7-string guitar chord

How to play A♯dim7 on 7-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 D string at the 2nd fret and your ring finger on the high B string at the 2nd fret. Let the G and high E strings ring open. Don’t play the low B and low E strings.

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

What notes are in A♯dim7?

A♯dim7, A♯ diminished seventh, is A♯, C♯, E and G: the root (A♯), the minor third (C♯), the diminished fifth (E) and the diminished seventh (G). 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, A♯, C♯, E and G, so A♯dim7 has the same notes as the diminished sevenths on C♯, E and G. Any of its notes can be the root.