7-String Guitar Chord Chart and Tabs in fake 8 string Tuning

BbmM13, Bb-M13, Bb minmaj13
Notes: B♭, D♭, F, A, C, E♭, G
6,10,8,6,7,6,6 (1431211)
6,6,8,10,7,6,6 (1134211)