About the Bdim Baritone chord
Play Bdim on Baritone ukulele with the 0 4 0 1 shape in DGBE tuning.
Place your index finger on the 1st fret of the E string and your pinky finger on the 4th fret of the G string. Leave the D and B strings 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
B
Quality
Diminished
Notes
B · D · F
How the Bdim chord works
B
Root (1)
The home note. It gives the chord its name.
D
Minor third (♭3)
The defining minor interval above the root.
F
Diminished fifth (♭5)
A lowered fifth that adds harmonic tension.