1.b1R Re2+ 2.Kg1 Ra2 3.Rb2 Ka7 4.Rg2 Re2 5.Sf2 Re1
A nicely arranged sequence, with the white rook clearing the rank and the king providing a waiting move. The queen could be replaced by a bishop.
Ravi Shankar: The final position is not too difficult to find especially when we notice that a switchback is needed to reach it. But, a fine sequence of moves!