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Olympic Coins

by Serhiy Grabarchuk Jr.

The five identical coins are arranged into the shape reminding the Olympic Rings symbol. Two coins are placed heads up, while three other - tails up, just as shown on the left above.

Can you reach the Goal position shown on the right with the help of the minimal number of single-coin moves? A single-coin move consists of sliding a coin to a new position where it must touch at least two other coins.

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Last Updated: January 7, 2007