The standard grips this chord is usually shown with.
Bmadd9 is B, D, F# and C#, a minor add nine. The shape this page opens on is written x5442x, lowest string first.

Also written Bm(add9), Bmin(add9) or B-add9. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 7 common shapes for Bmadd9 on the guitar, and 22 derived voicings in 3 families.
In which keys. Every note of Bmadd9 belongs to D major (the vi), F# minor (the iv), A major (the ii) and B minor (the i).
The common shapes, written lowest string first: x5442x, 75067x, 799779, xx9779, x-x-12-11-12-9, x-14-12-11-14-x, x-14-12-x-14-14.
Drop 2. A close-position chord with the second voice from the top lowered an octave. Sits on four adjacent strings. Bmadd9 has xx0422, 2404xx, x4443x, xx9779, 9997xx, x-x-11-11-12-10, xx4637, 7546xx.
Drop 3. The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped. Bmadd9 has x4x432, 2x042x, 7x463x, x5x677, 9x977x, x-14-x-11-14-10, 10-x-11-11-12-x, x-9-x-7-12-9.
Open string. An open string left ringing against a fretted grip. Because it costs no finger, it sounds a note the closed shape has none left for -- a tension on top, or a pedal root underneath. Either a familiar grip with open strings added, or a shape so sparse the open strings carry the chord. These belong to their key rather than to a shape, so D, A, G and E have many and Eb a handful. Bmadd9 has 7x060x, xx0607.
The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.