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

**Position:**

- In algebraic:White: King c7, Rooks c3 and d3, Knights b1 and e1,

Pawn e3 (6 pieces).Black: King b5, Knight a4 and c4, Knights

a4 and c4, Pawns a7, b6, and a5 (7 pieces). - In Forsyth notation:
8 p1K5 rp6 pk6 n1n5 2RRP3 8 1N2N3

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

**White to mate in 6 (Christoph Bandelow, 1959) **

Solution: 1. Rb3+ … 2. Rb5+ … 3. Rb3+ … 4. Rb5+ … 5. Nd3

*This problem was originally posted at http://www.permutationpuzzles.org/chess/bandelow3.html.*

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