The competition lasts several weeks. The problems proposed to participants usually require some study at home and cannot be solved by a quick attack. This makes a difference between this competition and an olympiad and makes the task of the competitor resemble scientific research rather than a sporting event.
The organizers need good problems to enrich the supply for future competitions. It is highly recommended that the problems consisted of several parts, starting with elementary questions and gradually rising up to difficult ones, may be even to open questions. The problems can be sent to the society address.
Problems of the 2010 student contest (pdf): English version, Russian version.