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New Released in April 2026

A Diminished Chord on Guitar (Adim)

The A diminished chord on guitar (Adim) uses the notes A, C, Eb. It is an open chord: some strings ring without fingers. Strum all six strings. First the picture, then each finger, then three chords to practise Adim with.

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  • MIDI keyboard
  • Digital or acoustic piano
  • Guitar
  • Computer, phone or tablet
5fr××
Adim A C Eb

How to play Adim on guitar

5fr××
Adim A C Eb

Fingers and frets

  • Middle: 6th string (low E), fret 5
  • Little: 4th string (D), fret 7
  • Ring: 3rd string (G), fret 5
  • Index: 2nd string (B), fret 4

Strings to play

5x754x: × = do not play, 0 = open string.

Chords that go with Adim

Pick any two of these and switch back and forth: they all fit with Adim.

A · D · E

Which note each string plays

6th string (low E)fret 5: A
4th string (D)fret 7: A
3rd string (G)fret 5: C
2nd string (B)fret 4: Eb

Slide this shape along the neck: fret 3 = Gdim, fret 4 = Abdim, fret 6 = Bbdim, fret 7 = Bdim.

Practise Adim in three steps

  1. Put the shape down slowly and pick each string once to check it rings.
  2. Take the hand off and put the whole shape back at once, ten times in a row.
  3. Change from Adim to A and back for a minute; then add D.

Where Adim is used

Adim wants to move up one fret: play Adim, then Bb or Bbm, and it resolves.

ChordRunner on a phone next to an acoustic guitar, with a chord block on screen

Play Adim in a game

Adim turns up between other chords in ChordRunner; strum it on time and the runner jumps. MIDI keyboard or microphone, both work. MIDI keyboard or microphone, both work.

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Adim on piano · Easy guitar chords · Guitar chord game

Common questions

Is Adim easy on guitar?

Yes, it is one of the open chords beginners learn first. Start slowly, check that every string rings, then practise switching to A.

Which fingers do I use for Adim?

Middle finger: 6th string (low E), fret 5, little finger: 4th string (D), fret 7, ring finger: 3rd string (G), fret 5, index finger: 2nd string (B), fret 4.

Can I practise Adim with a microphone or MIDI keyboard?

Both work in ChordRunner. The microphone hears an acoustic or electric guitar; a USB MIDI keyboard is detected automatically. Either way A, C, Eb must sound together.

Your instrument is the controller.

ChordRunner is a browser game that teaches piano and guitar chords: a chord appears on screen, you play it on a real instrument, and your runner jumps. MIDI keyboard or microphone, both work.

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