B flat diminished guitar chord (Bbdim)
Also written A#dim (A sharp diminished)
A diminished chord stacks two minor thirds: root, minor third, diminished fifth. Tense and unstable, it is mostly used as a passing chord.
Positions and fingerings
Position 1 fret 1
Position 2 fret 6
Position 3 fret 8
× muted string · o open string · numbers: fingers (1 index, 2 middle, 3 ring, 4 pinky)
Chord notes
| Note | Interval |
|---|---|
| B♭ (B flat) | root |
| D♭ (D flat) | minor third |
| F♭ (F flat) | diminished fifth |
Formula: 1 – b3 – b5 · B♭ – D♭ – F♭
A progression with this chord
The diminished chord works as a passing chord to the chord a semitone above.