A Dim 9 chord — Open G
1 voicing · Open G
Tuning:DGDGBD
Fret 7 position
1 / 1
Chord tones
A
R
C
+3
D#
+6
F#
+9
B
+2
A Dim 9 in other tunings
Dim 9 in other keys — Open G
A Dim 9 in Open G — video lessons
About A Dim 9 in Open G
The A Dim 9 chord contains the notes A, C, D#, F#, B. 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.