Mate in 4

White to play and mate in 4
composed by Joseph C.J. Wainwright (circa 1901)

Originally posted by aging blitzer
[fen]8/2p3p1/8/2p1p1p1/2p1k1p1/2P3P1/3RK3/5R2 w - - 0 1[/fen]
White to play and mate in 4
composed by Joseph C.J. Wainwright (circa 1901)

Nice! Black is in zugzwang.

1.Rdd1!

Originally posted by fetofs
Nice! Black is in zugzwang.

1.Rdd1!

correct, but then what?

Originally posted by aging blitzer
correct, but then what?

It's pretty straightforward: Black will have to move one of its pawns, then its king:

1...c6 2.Rd6 g6 3. Kf2! (avoiding an stalemate) Kf5 4. Ke3#

If 1...g6 White proceeds in a similar way, symetrically.