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Cut off the Corners  
by Serhiy Grabarchuk, Jr.
Eight identical coins are placed in the cells of a 5x5 grid as shown above. The coins create a number of right angles. A coin angle considered to be the right angle if the centers of any three coins lie on the lines which cross each other at 90 degrees. For example, the two coins in the central row and the middle coin in the bottom row create the right angle with the vertex in the center of the bottom coin.

The object of the puzzle is to move the minimum number of coins into some other cells in order to get rid of all the right angles on the grid. No coin must be left outside the grid, and no two coins are allowed to occupy the same cell.

To move a coin, drag and drop it. Please, keep in mind, it is required to move the minimum number of coins only.
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Posted: March 29, 2007   Last Updated:
March 30, 2008
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