Luke Moratti and Charles Fraser (both 16) contested the 147-year-old school's first darts championship and it went to a sudden death play-off, before Luke clinched the title with a double-16.
"I usually always aim for the 19, because it's the easiest one to get," he said, clutching his trophy.
He also revealed a secret advantage - using Daffy Duck flights on his darts.
"They're my lucky charm," he said.
OBHS chemistry and science teacher Tim Ashdown introduced the sport to the school three months ago.
"When I moved here from England a couple of years ago I was surprised no-one had done darts here before. It had never been offered as a sport in Otago Boys' history. So, I brought a board along and it's proved very popular with the boys.
"It's an excellent game. It's got the essence of sport. The success or failure is right there to see and there's no-one to blame but yourself. You can't blame the weather, or the conditions, or the referee. It also provides the opportunity for a bit of banter, which is fun."
The New Zealand Darts Council had supported the initiative by donating two dartboards to the school.
"It's been popular across [the school]," Mr Ashdown said.
"The boys' skills have really improved since we started. It's been very competitive and some of the boys are very good now."
Plans were now afoot to start a Dunedin inter-school darts competition, he said.
The OBHS junior final between Bas Dalloway (15) and Jordi Hillerby (13) will be held tomorrow.
