Learn › A Flat Half Diminished Chord on Guitar (Abm7b5)
New Released in April 2026
A Flat Half Diminished Chord on Guitar (Abm7b5)
A flat half diminished (Abm7b5) on the guitar: press the strings shown below; some strings ring open. Strum all six strings and you hear Ab, Cb, Ebb, Gb. First the picture, then each finger, then three chords to practise Abm7b5 with.
No account, no download. The demo has limited content. Advanced features are in ChordRunner Premium.
- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Abm7b5 chord diagram
Finger by finger
- Middle: 6th string (low E), fret 4
- Ring: 4th string (D), fret 4
- Little: 3rd string (G), fret 4
- Index: 2nd string (B), fret 3
Which strings to strum
4x443x: × = do not play, 0 = open string.
The notes inside Abm7b5, string by string
| 6th string (low E) | fret 4: Ab |
|---|---|
| 4th string (D) | fret 4: Gb |
| 3rd string (G) | fret 4: Cb |
| 2nd string (B) | fret 3: Ebb |
From Abdim to Abm7b5: 4th string (D): fret 6 → fret 4.
Slide this shape along the neck: fret 2 = F#m7b5, fret 3 = Gm7b5, fret 5 = Am7b5, fret 6 = Bbm7b5.
Where Abm7b5 is used
Abm7b5 leads to C#7 and then home: it is the ii chord of a minor key, as in Abm7b5 → C#7 → F#m.
Play Abm7b5 in a game
Strum Abm7b5 near the microphone when it comes up in ChordRunner: the game checks all four notes, Ab, Cb, Ebb, Gb, and moves on. MIDI keyboard or microphone, both work. MIDI keyboard or microphone, both work.
Play the demoCommon questions
What notes are in the Abm7b5 guitar chord?
A flat half diminished has three notes: Ab, Cb, Ebb, Gb. On the guitar some of them are doubled on different strings, so all six (or five) strings sound like one chord.
What is the difference between Abm7b5 and Abdim on guitar?
Abm7b5 adds one note to Abdim: Gb, on top of Ab Cb Ebb. From Abdim to Abm7b5: 4th string (D): fret 6 → fret 4.
Which fingers do I use for Abm7b5?
Middle finger: 6th string (low E), fret 4, ring finger: 4th string (D), fret 4, little finger: 3rd string (G), fret 4, index finger: 2nd string (B), fret 3.
Does ChordRunner hear Abm7b5 on guitar?
Yes. Strum it near the phone or computer microphone and the game checks the four notes Ab, Cb, Ebb, Gb. A USB MIDI keyboard works too.
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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