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New Released in April 2026

B Diminished Chord on Guitar (Bdim)

To play Bdim on guitar, press the strings shown below; some strings ring open. Then strum from the 5th string down: the notes B, D, F ring together. Here is the shape, finger by finger, plus the chords you will play next to it.

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  • MIDI keyboard
  • Digital or acoustic piano
  • Guitar
  • Computer, phone or tablet
2fr××
Bdim B D F

Bdim chord diagram

2fr××
Bdim B D F

Finger by finger

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

Strings to play

x2343x: × = do not play, 0 = open string.

Where Bdim is used

Bdim wants to move up one fret: play Bdim, then C or Cm, and it resolves.

Bdim string by string

5th string (A)fret 2: B
4th string (D)fret 3: F
3rd string (G)fret 4: B
2nd string (B)fret 3: D

Slide this shape along the neck: fret 1 = Bbdim, fret 3 = Cdim, fret 4 = C#dim, fret 5 = Ddim.

A short Bdim routine

  1. Place the fingers one at a time, then strum and listen to each string.
  2. Lift the hand, then land all fingers together. Repeat ten times.
  3. Change from Bdim to B and back for a minute; then add E.

Play Bdim with these chords

These chords share notes with Bdim and sound right next to it. Practise switching between them.

B · E · F#

Bdim higher up the neck

7fr××
Bdim B D F

Same chord, different place: handy when the next chord is up the neck too.

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

Play Bdim in a game

Bdim 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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Bdim on piano · Easy guitar chords · Guitar chord game

Common questions

Is Bdim 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 B.

Which fingers do I use for Bdim?

Index finger: 5th string (A), fret 2, middle finger: 4th string (D), fret 3, little finger: 3rd string (G), fret 4, ring finger: 2nd string (B), fret 3.

Can I practise Bdim 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 B, D, F 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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