I thank Christoph Bandelow for allowing this chess problem, with a mathematical flavor, to be posted here.

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: 1. Kc3 Ne4+ 2. Kd3 Nf2+ 3. Ke3 Nxg4+ 4. Kd3 Nf2+ 5. Kc3 Ne4+ 6. Kb4 Nd2 7. g4

This problem was originally posted at http://www.permutationpuzzles.org/chess/bandelow2.html.