Fdim

F1A♭♭3C♭♭5

Two minor thirds stacked. The fifth is diminished, so it cannot be dropped without losing the chord.

on guitar on piano the scale

Every fingering that fits a hand

Fig. 2

x542

easy

Fig. 3

a878

hard

Fig. 4

a87x

easy

What is true of it

Fdim is F, A♭ and C♭ — 1, b3 and b5 counted from F.

The easiest of the 3 fingerings below is x542: 3 fingers, held at the 2nd fret.

None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.

1 string stays silent.

Where its notes are on the neck

Fig. 5 — first 12 frets

The brass dots are F, the root. Everything else is a chord tone with its degree printed in it.

With a different note underneath

first inversion

Fdim/A♭

x878

second inversion

Fdim/C♭

454x

An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.

F in other shapes

Fmajor Fmminor Faugaugmented F5power chord Fsus2suspended second Fsus4suspended fourth

Cdim C♯dim D♭dim Ddim D♯dim E♭dim Edim F♯dim all 374