Our eighth problem features a very odd position where White can promote no fewer than five pawns! It might appear to be easy, but there is only ONE way to force a mate in four!

WHITE TO MOVE AND MATE IN FOUR

1998
1.Ra2 1.b8=Q Rxh3. 1...Rxh3 2.e8=R! Re3 3.Rxe3 Kg1 4.Re1 mate.