NWU 16 Series 27/02/2020 - Schools - Pionier High School Starts NWU Series Defence This Weekend - Pionier High School will start the defence of their 2019 NWU 16 Series against Piet Retief this weekend. The NWU 16 Series is an early-season competition where 16 of the top medium schools of the northern provinces compete against each other. Pionier was the champions in 2018 also while Bekker shared the spoils with Pionier in 2017.