Ddim is a diminished, spelled D, F and Ab. In Drop D tuning (D2 A2 D3 G3 B3 E4) the easiest shape is xx0131, which sits at fret 1, needs a barre across 3 strings at fret 1, lets 1 string ring open and mutes 2 strings. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
D
F
Ab
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.
xx0131sits at fret 1, needs a barre across 3 strings at fret 1, lets 1 string ring open and mutes 2 strings05676xsits at fret 5, spans 2 frets, lets 1 string ring open and mutes 1 string08010910sits at fret 8, spans 2 frets and lets 2 strings ring open08079xsits at fret 7, spans 2 frets, lets 2 strings ring open and mutes 1 string050764sits at fret 4, spans 3 frets and lets 2 strings ring open08676xsits at fret 6, needs a barre across 3 strings at fret 6, lets 1 string ring open and mutes 1 string011010910sits at fret 9, spans 2 frets and lets 2 strings ring open011010xxsits at fret 10, spans 1 fret, lets 2 strings ring open and mutes 2 strings053xxxsits at fret 3, spans 2 frets, lets 1 string ring open and mutes 3 stringsxx0131513sits at fret 13, needs a barre across 3 strings at fret 13, lets 1 string ring open and mutes 2 stringsxx12131513sits at fret 12, spans 3 frets and mutes 2 strings0110131513sits at fret 11, spans 4 frets and lets 2 strings ring open
Keys Ddim belongs to
Ddim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.