|Rose(RO):||(1,2) Octagonal Rider (extents the move of the Knight on a circular path e.g. a4-b6-d7-f6-g4-f2-d1-b2 or a4-c5-e4-f2).|
No. 1715 Hans Uitenbroek
original - 02.06.2022
Rose e2, c3
Solution: (click to show/hide)
(C+ by Popeye 4.87)
White has two double pinned pieces. B1 unpins a piece on the Bishop/Rook-line, so White can make
a Pelle-move on the Rose-line. The former pinner then unpins the same piece on the Rose-line,
creating a battery. The now completely unpinned piece gives check, so Black must fire the battery.
The other White piece stays pinned by the Rook/Bishop, so it can’t take the Rose. Exchange of function between White Knight and Rose and Black Bishop and Rook.