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## 'Makeover' printed from http://nrich.maths.org/

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This is a game for one player. Exchange the positions of the two
sets of counters in the least possible number of moves. A counter
may be moved by sliding it to an adjacent empty square or by
jumping over an adjacent counter of either colour into an empty
square. It is possible to do this in forty six moves, but if you
can succeed in fifty moves you are doing well.