CHANDIGARH, Jan 27: Sunil Yadav of Sarvitkari School, Sector 40, was unbeatable in both the 400 and 1,500 metre events on the opening day of the under-19 boys section in the Chandigarh State Inter-School athletic meet being held at Sector 7 Sports Complex.Sunil ran a well judged pace to win 400-metre in 52.3. He clocked 4:16.8 to win gold medal in the 1,500m.Manmohan also secured two gold medals in the under-17 section. He won first position in 1,500 and 800 metres.