| by Serhiy Grabarchuk, Jr. |
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Five identical coins are arranged
into the shape reminding the Olympic Rings symbol, only exchanged
its two rows of the rings. Three coins are placed heads up and two -
tails up, just as shown on the left.
Can you reach the Goal position shown on the right with the
minimum number of special single-coin moves? A special single-coin
move consists of sliding a coin to a new position where it must
touch only (!) two other coins one of which is placed heads up,
while another - tails up. The examples of legal and illegal moves
are shown in the bottom row of the illustration. The case when this moved coin (marked as
@) makes a straight line triad, like O@O (where both O's are the two
unmoved coins), is not allowed.
How many moves will you need?
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*The first Olympic Coins puzzle can be found
here.
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