How do I know what this chord is
The chord consists of F# a d b . So in theory it could be
1 3 4 5- F#sus4
1 3 5 6- D6
1 3 5 7 - Bmaj7
But Which is it?
B to D is the minor third giving you the Bm chord.
B to F# is the 5th completing the chord
B to A is the 7th
Your other options:
1 3 4 5- F#sus4 - this doesn't work because the sus4 needs to replace the (minor) 3rd in your chord, not add to it.
1 3 5 6- D6 - yes, you could call it this and many books and guitarists often do.
1 3 5 7 - Bmaj7 - this was your closest guess. But - Bmaj7 has a D# and an A# in it - giving you B, D# (major third), F# (the 5th) and A# the major 7th
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