guitar chord
F♯add9
A major triad with a ninth added and no seventh — which is what tells it apart from a ninth chord.
Written the other way round it is G♭add9 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
xx4324
hard
2141xx
hard · no 5
x9869x
hard
edbdxx
hard
x98b9x
hard · no 5
What is true of it
F♯add9 is F♯, A♯, C♯ and G♯ — 1, 3, 5 and 9 counted from F♯.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is xx4324: 4 fingers, held at the 2nd 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 strings stay silent.
Where its notes are on the neck
The brass dots are F♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
F♯add9/A♯
696676
F♯add9/C♯
9b8bxx
F♯add9/G♯
xbbbbx
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.