Barre chord
fret 1, A shapex13221
B♭mmaj7 is the B♭ minor major 7 chord. Its notes are B♭, D♭, F and A. It is the same chord as A♯mmaj7. A minor triad with a major seventh, useful for descending minor lines.
x13221
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every B♭, D♭, F and A on the first 12 frets. The filled dots are the root, B♭. Build your own shape from any nearby group.
Other B♭ chords
Other minor major 7 chords