The Ministry of Education, Youth and Sports, in collaboration with the Cambodian Badminton Federation (CBF), opened the 2009 National Badminton Championship at Olympic Stadium Sunday featuring about 100 participants from 11 clubs. The tournament is split into levels A-I and A-II, with single and team categories for both men and women. Chea Bun Heng, representative of the organising committee, said the CBF had also added U13 and seniors (40-50 years old) categories this year.