A# Dim 7 chord — Open G
4 voicings · Open G
Tuning:DGDGBD
Fret 2 position
1 / 4
Chord tones
A#
R
C#
+3
E
+6
G
+9
A# Dim 7 in other tunings
Dim 7 in other keys — Open G
A# Dim 7 in Open G — video lessons
About A# Dim 7 in Open G
The A# Dim 7 chord contains the notes A#, C#, E, G. In Open G tuning (strings: D–G–D–G–B–D), the chord shapes differ from standard tuning because the open string pitches change. Open G tuning lets you play a G major chord across all open strings — widely used in blues and slide guitar. Diagrams above show all playable shapes in this tuning.