1...Bb7 2.Qxb7#

1.c7! (~ 2.c8=S#)

1...Bb7 2.Qa5+ Ba6 3.c8=R Kb7 4.Qc7#

1...Bc6 2.c8=S+ Ka8 3.Qb6 ~ 4.Qa7#

1...Bd5 2.c8=Q Bxe6+ 3.Qxe6 ~ 4.Qea6#
1...Bxe4 2.fxe4 f3 3.c8=B ~ 4.Qb7#

A new complex original idea - four promotions follow exactly

the four movements of the black figure along the same line along