The standard grips this chord is usually shown with.
Badd9 is B, D#, F# and C#, a add nine. The shape this page opens on is written x21x22, lowest string first.

Also written B(add9), Badd2 or B add nine. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 5 common shapes for Badd9 on the guitar, and 20 derived voicings in 2 families.
In which keys. Every note of Badd9 belongs to C# minor (the ♭VII), Eb minor (the ♭VI), E major (the V), F# major (the IV), Ab minor (the ♭III) and B major (the I).
The common shapes, written lowest string first: x21x22, 76x677, xx98x9, x-14-13-11-14-11, x-14-13-x-14-14.
Drop 2. A close-position chord with the second voice from the top lowered an octave. Sits on four adjacent strings. Badd9 has x4444x, xx9879, 9998xx, x-x-11-11-12-11, xx1422, 2414xx, 7646xx, xx4647.
Drop 3. The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped. Badd9 has 2x142x, x4x442, 7x464x, x6x677, 9x987x, x-9-x-8-12-9, x-14-x-11-14-11, 11-x-11-11-12-x.
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.