Problem

Move checkers so that all three white checkers will be on the left followed by black ones. They can be only moved in pairs of adjacent checkers. Ony three moves are necessary to solve this problem.

Click on a '<' button to move the two adjacent checkers above the button. The pair will move to the two nearest vacant spots on the left.

 

The idea of this puzzle is from the book 'The Moscow Puzzles' by Boris Kordemsky. Dover Publications, New York.

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