1.Rd4?(A)~ 2.Rd5#

1...Q:d4! 2.B:d4(B) ed(position A1) 3.c4+ dc!

1.Bd4!(B)~ 2.Na7#, c4#

1...ed 2.Rd4(A) Q:d4(position A2) 3.c4+ Q:c4 4.dc#mm