Banjo B6 chord (Double C)B sixth on the 5-string banjo: 3 4 6 6, and 3 more shapes

Frets, string 4 to string 1: 3 4 6 6 (from the 3rd fret)

1. String 4 (C): 3rd fret, index finger, D♯
2. String 3 (G): 4th fret, middle finger, B
3. String 2 (C): 6th fret, ring finger, F♯
4. String 1 (D): 6th fret, little finger, G♯
5. String 5, the short g: open, G, not in the chord

Sounds: D♯ B F♯ G♯  ·  B6 is B, D♯, F♯, G♯ (1 · 3 · 5 · 6)

The 5th string: the short g rubs against the F♯ and G♯ in this shape, a semitone away: some players let it ring, some skip it.

Double C tuning: gCGCD, the short 5th string first, then strings 4 to 1.