11 January 2014

130. The King and his Guards: Remove 4 Guards

Easy Medium Hard Extreme


A King is protected by 12 guards in his castle as indicated. There are 4 guards needed for each of the 4 walls of his castle. The guards on the corners protect 2 walls.

The King then decides to take 4 guards off duty and to move the remaining guards around so that the security is still 4 guards per wall. What did he do?

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