guitar chord
B♭m9
A minor seventh with a ninth on top.
Written the other way round it is A♯m9 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
686668
moderate · barre
686698
hard · barre
6465xx
hard · no 5
6366xx
hard · no 5
xx8698
hard · no 5
What is true of it
B♭m9 is B♭, D♭, F, A♭ and C — 1, b3, 5, b7 and 9 counted from B♭.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.
The easiest of the 5 fingerings below is 686668: 3 fingers, one of them barring the 6th fret, held at the 6th fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
2 of the 5 need a barre.
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♭m9/D♭
x4311x
B♭m9/F
143111
B♭m9/A♭
446564
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.