Andreas Röver's exchange puzzle for IPP 34 in London.
The puzzle has 3 mirror pairs of pieces. They have a mark on one side to distinguish the two sides.
The tray has a coloured mark at the outer rim of the area where the pieces are supposed to be placed.
The task is to put all 6 pieces into the tray with the same face up (either all marks on top, or all marks on the bottom) so that the outer marked rim in the tray is completely covered. There are 2 different solutions.
It is relatively simple to find those 2 solutions but for even easier challenges you might want to relax the constraints:
ignore the rim: 29 solutions
additionally ignore the mark on the pieces: 1976 solutions
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