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Coin Tree*

Coin Puzzles

by Peter Grabarchuk

Coin Tree by Peter Grabarchuk
 
 
The Coin Tree is formed of six coins -- three silver (lighter ones) and three gold (darker ones). The goal is to swap the the silver and the gold coins as shown in the Goal diagram.

Move one coin at a time so that in its new position it touches at least two other coins from the unmoved group, except the case when this coin (marked as @) makes a straight line triad, like O@O.

Two solutions are possible. One with the Coin Tree that does not rotate compared to its start position, as shown in the Goal diagram. Another solution allows getting the final Coin Tree rotated for some angle. Can you find both of them?
*) Puzzle concept: Copyright 2007 Peter Grabarchuk. All Rights Reserved.
 
Last Updated: October 20, 2009
Posted: December 29, 2007
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