About the Bbdim Baritone chord
Play Bbdim on Baritone ukulele with the 2 3 2 0 shape in DGBE tuning.
Place your index finger on the 2nd fret of the D string, your middle finger on the 2nd fret of the B string, and your ring finger on the 3rd fret of the G string. Leave the E string open. Strum all four strings and check that each one rings cleanly.
Read the frets across D, G, B and E. A 0 means open and x means mute. These fingerings are for Baritone strings. A Standard gCEA chart uses different shapes for the same chord names.
Root
Bb
Quality
Diminished
Notes
Bb · Db · Fb
How the Bbdim chord works
Bb
Root (1)
The home note. It gives the chord its name.
Db
Minor third (♭3)
The defining minor interval above the root.
Fb
Diminished fifth (♭5)
A lowered fifth that adds harmonic tension.