Gdim(maj7) 8-string guitar chord

How to play Gdim(maj7) on 8-string guitar

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

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

What notes are in Gdim(maj7)?

Gdim(maj7), G diminished major seventh, is G, B♭, D♭ and F♯: the root (G), the minor third (B♭), the diminished fifth (D♭) and the major seventh (F♯). Its formula is 1 ♭3 ♭5 7.