Bdim is a diminished, spelled B, D and F. In DADGAD tuning (D2 A2 D3 G3 A3 D4) the easiest shape is x23420, which sits at fret 2, needs a barre across 4 strings at fret 2, lets 1 string ring open and mutes 1 string. 12 positions for it are shown below, from the nut up to fret 14.
Notes and intervals
Note
B
D
F
Interval
1P
3m
5d
12 ways to play it
Ordered by how hard they are to fret, easiest first, one per position on the neck. Fret numbers are relative to the position marked beside each grid.
x23420sits at fret 2, needs a barre across 4 strings at fret 2, lets 1 string ring open and mutes 1 string980780sits at fret 7, spans 2 frets and lets 2 strings ring openxxx453sits at fret 3, spans 2 frets and mutes 3 stringsxxx450sits at fret 4, spans 1 fret, lets 1 string ring open and mutes 3 strings980xxxsits at fret 8, spans 1 fret, lets 1 string ring open and mutes 3 strings950780sits at fret 5, spans 4 frets and lets 2 strings ring open01415xxxsits at fret 14, spans 1 fret, lets 1 string ring open and mutes 3 stringsx14010140sits at fret 10, spans 4 frets, lets 2 strings ring open and mutes 1 string01412xxxsits at fret 12, spans 2 frets, lets 1 string ring open and mutes 3 stringsx20423sits at fret 2, spans 2 frets, lets 1 string ring open and mutes 1 stringx20420sits at fret 2, spans 2 frets, lets 2 strings ring open and mutes 1 string023420sits at fret 2, needs a barre across 4 strings at fret 2 and lets 2 strings ring open
Keys Bdim belongs to
Bdim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.