ThorAvaTahr: You are kidding right? This is not a beginner level problem. I would rate it at least 3k, maybe 1k.
Reuven: Ah I'm no good at difficulty evaluation. The reason I think it should be in the beginner exercises collection is that it shows, in a rather simple way an interesting type of move. If you however find it more fitting for kyu exercises, feel free to request moving it there (Or rename the page if you have the capability ^^*).