1.Bb1,Rg7, Mb7,Rf8, Ph8#. 2.Bb1,Rg7, Mb7,Rf6, Bb6#. 3.Bb1,Rg7, Mb7,Rh8, Mb2#. 4.Bb1,Rg7, Mb7,Rh6, Ph8#.