A# Diminished chord — Open D
3 voicings · Open D
Tuning:DADF#AD
Open position
1 / 3
Chord tones
A#
R
C#
+3
E
+6
A# Diminished in other tunings
Diminished in other keys — Open D
A# Diminished in Open D — video lessons
About A# Diminished in Open D
The A# Diminished chord contains the notes A#, C#, E. In Open D tuning (strings: D–A–D–F#–A–D), the chord shapes differ from standard tuning because the open string pitches change. Open D tuning gives an open D major chord across all strings — ideal for slide guitar and Joni Mitchell-style playing. Diagrams above show all playable shapes in this tuning.