Chess problem by Christoph Bandelow

Position:

In algebraic:
White: King b4, Rooks b2 and e1, Bishop a1, Knight d4, Pawns c5, g3, g4 (8 pieces).
Black: King c1, Rook h1, Bishop d1, Knights d2 and g1, Pawns c6, d5, e2, g5, h2 (10 pieces).

In Forsyth notation:

8
8
2p5
2Pp2p1
1K1N2P1
6P1
1R1np2p
B1kbR1nr

From the chess problem collection "Problem-Juwelen" by Herbert Grasemann. Publisher: Siegfried Engelhardt Verlag, Berlin 1964.

White to mate in 8 (Christoph Bandelow, 1958)
Solution