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Puzzle 12:
Answer page below


Bolt Swap: This little gem was shown to me by Markus Götz. Swap the positions of the white and black kings in as few moves as possible -- however, there is a hidden rule that governs whether a king can be moved or not. Try to discover the rule; it will be pretty hard to solve the puzzle without knowing it!

Answer: http://solvepuzzles.googlepages.com/answers12