Chessproblem
There's only one move that wins. White to begin.
To see the solution: drag the mouse from here....
Solution:
1. Rxe6! Rxe6 2. d7 Re1+ 3. Kf2 Re1 4. Bd4!
or
1. .........., fxe6 2. Bb6!!
followed by d7 and d8
to here.