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The MG Coin Puzzle

Coin Puzzles

by Serhiy Grabarchuk

The MG Coin Puzzle by Serhiy Grabarchuk
 
 
This puzzle is dedicated to Martin Gardner.
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The M is formed of seven coins, see the Start diagram. The goal is to rearrange the M into the G, see the Goal diagram. Note that the final G must be in the upward position, exactly as shown.

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.

Could you achieve the goal in four single coin moves? How many single coin moves will you need to rearrange the G back into the M?
 
Last Updated: October 21, 2009
Posted: October 20, 2009
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