Mathematical regatta - a competition for school teams held annually. This collection contains materials from all Moscow mathematical regattas for the 200506 academic year. The rules of the regatta are also given, the technology of its holding and the features of preparation are described. The appendix includes materials from school mathematical regattas and regattas held at all-Russian festivals. The book is addressed to high school teachers, methodologists, schoolchildren and may be of interest to all lovers of mathematics.