Problem : Greenwood 1867

Here you go...a problem from 1867, courtesy of a Mr W. Greenwood.

The original problem stated mate in 4, but in 2013 , a mate in 3 is also there ( thanks to Houdini for confirming it :)

Enjoy !

White to play
2B5/5R1K/4p1p1/6kp/4P2R/6P1/8/8 w - - 0 1

Mate in 4 [ 1. Re7 e5 2. Rxe5 Kf6 3. Re6 Kf7 4. Rf4#  ]

Mate in 3 [ 1. Kg7 e5 2.Bf5 gxf 3. Rxf5# ]