guitar chord
A♯maj9
A major seventh with a ninth on top.
Written the other way round it is B♭maj9 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
x10211
moderate
600535
moderate · no 5
600536
moderate · no 5
60053x
easy · no 5
x1021x
open · no 5
What is true of it
A♯maj9 is A♯, C𝄪, E♯, G𝄪 and B♯ — 1, 3, 5, 7 and 9 counted from A♯.
C𝄪 and G𝄪 are double sharps, and they have to be: every letter from A♯ upwards is used once, so the 3 cannot be written any other way.
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 x10211: 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 A♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
A♯maj9/C𝄪
xx0211
A♯maj9/E♯
100311
A♯maj9/G𝄪
x00311
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.