21 Apr 2005 @ 11:59 PM 

http://www.economist.com/science/displayStory.cfm?story_id=3445734

Posted By: Scott Blomquist
Last Edit: 21 Apr 2005 @ 11:59 PM

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  1. chad says:

    here’s a link to an interactive "dad’s puzzle". kinda fun.

    the 59 move count seemed large to me at first, ’cause you make what seems to be lots of progress pretty quickly, but as sblom says, this is a tricky sliding-block puzzle.

    http://www.puzzleworld.org/SlidingBlockPuzzles/pennant.htm

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