C♯dim7 8-string guitar chord

How to play C♯dim7 on 8-string guitar

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

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

What notes are in C♯dim7?

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