I made this up in about 5 minutes so if there's another solution, post it

I was thinking in the direction of 1.Bxb7 Ka7 2.Rb1 Kb8 3.Bc6 Ka7 4. Nc4+ Qa5. 5.Rxa5#

The last move of the queen can be located anywhere in my solution, but the white rooks can always take the queen. Instead of moving the king then, black moves the queen.

 mate in three1.Nc6+.....bxc6. 2.Rb1+.....Qb5.....3.Rxb5+

eddieboy wrote:

 mate in three1.Nc6+.....bxc6. 2.Rb1+.....Qb5.....3.Rxb5+

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I don't understand this - those are the first three moves of the mate, but those three moves alone are not checkmate.  As shown, after cxb5, Ra8#.

   you cant go check Ra8, because the the bishop covered  a pawn on c6. just correct me if im wrong

how about 1 Nc6+ bxc6 2 Bxc6 and mate on a8 next move

Yes its mate in 4.... 2. Bxc6 Qa5 3. RxQ and mate at a8 or Rb1

nice combination:-)

exact as my first thoughts. good job.