1.h4?A zz. h5 a 2.Kf2 B (~ 3.Kg3 ~ 4.Ra1#) Kh2 3.Ra3 C zz. Kh1 4.Rh3#, 1...Kg1!,
1.Kf3? h5 a 2.Ra1+ D Kh2 3.h4 A zz. Kh3  4.Rh1#, 1...Kg1!,
1.Kf2! B(~2.Kg3 ~3.Ra1#) h5 a 2.h4 A (~3.Kg3 ~4.Ra1#) Kh2  3.Ra3 C  zz. Kh1  4.Rh3#,
1...Kh2  2.Ra3 C zz. h5 a 3.h4 A zz. Kh1 4.Rh3#, 2... Kh1 3.Kg3 ~ 4.Ra1# D.

Model mates & change of continuation in 3 phases & change of functions  with a pseudo cycle of moves in a tanagra.