guitar chord
B♭m6
A minor triad with a major sixth added, which is why it is not simply a minor chord with a flat seventh.
Written the other way round it is A♯m6 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
x13021
moderate
x13023
moderate
x1302x
open
64506x
hard
64306x
hard
What is true of it
B♭m6 is B♭, D♭, F and G — 1, b3, 5 and 6 counted from B♭.
These are also the notes of Gm7♭5/B♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is x13021: 4 fingers, held at the 1st fret.
1 of them use open strings, which is what makes a shape quiet to change to.
1 string stays silent.
Where its notes are on the neck
The brass dots are B♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
B♭m6/D♭
x45066
B♭m6/F
113023
B♭m6/G
31302x
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.