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Carl Hoff says: "Back in late 2008 and early
2009, I toyed with writing a program to solve the original Untouchable
11 puzzle made for Smart-Kit by
Peter Grabarchuk. The hardest version
of that puzzle has only 7 solutions not counting rotations or
reflections. When I was invited to G4G10 and informed I needed a gift
for the Gift Exchange, I immediately wondered if I could use that
program to make an even harder puzzle based on the same rules. I felt
Untouchable 11 was the hardest 11 piece 2D puzzle I was aware of at
the time. I’ve now searched 100’s of 11 piece subsets of the
hexominoes and to date this is the hardest set I’ve found which can
still be placed on the 12x12 board. It has 2 solutions. The search
continues for a set with just a single solution..." |
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