This thread is dedicated for a marathon on relatively easy problems. The rules are similar to the Geo Marathon or the Combi Marathon, just with a focus on easier problems.
We'll start by posting problems, and someone else will post the solution. If someone solves a problem, they should post a pretty solution, and they have the honor of posting the next problem. If the solver of the previous problem doesn't post a new problem along with his solution, anyone else can post a new problem. If no one solves a problem within 48 hours of posting, the problem poster should provide the solution or a link to the solution. Then we'll jump to the next problem.
The problem difficulty should be at most the hardest found in BDMO. The focus is on easy problems, so even problems of BDMO National #1 level are welcome. Ideally most of the problems will be somewhere between these two extremes, and help out all the people still looking to break at BDMO nationals.