Otago Boys' High School won the debating as well.
There were no cameras at that event, but perhaps the school team can mount a good argument for some coverage at next year's sports exchange with Southland Boys' High School.
Instead, most attention was trained on the First XV match.
It is a highly-anticipated interschool clash, and Sky Sport broadcast the match live from Invercargill.
The contest went the way of the visitors. Otago Boys' recorded a 22-8 victory.
It capped off a big eight days for the school. It beat King's High School 44-0 mid-week and dispatched John McGlashan College 65-7 on Saturday.
Southland offered a lot more resistance, though. The score was locked at 8-8 with about 20 minutes remaining.
Otago Boys' had spent long periods of the game defending and struggled with their discipline at times.
But talented first five-eighth Tevita Asi gave his side the spark it needed. He slipped through a hole and brushed aside three tacklers on a 50m run.
The fourth and fifth tacklers bundled him into touch. But Southland could not get the ball into the lineout straight.
Otago Boys' scored from the ensuing scrum. Asi finished what he started when he crashed over.
Exciting centre Jake Te Hiwi provided the icing. He made a tremendous skip pass to his winger and stayed in support to eventually score and seal the win.
Otago Boys' coach Regan Turoa was disappointed with his side's discipline, but proud of the character showed against a quality Southland Boys' unit.
His son Levi Turoa picked up a yellow card for a dangerous tackle. It was one of about three clumsy efforts by Otago Boys'.
''I was very, very happy with the way everyone dug in,'' he said.
''But I think we struggled in the first half. We found it hard to adjust to the officiating and found it hard to consolidate and stick with our structures.''
Powerful No8 Semisi Taeiloa left the field early after he suffered a head knock. Turoa said his young charge was fine.
Openside flanker Oliver Griffin was arguably the man of the match. He got through a hectic workload.
Asi was not far behind. He produced another quality effort.
Otago Boys' won the interschool 8-2.
As reported earlier, it won the debating, and also recorded a 5-1 win in the badminton, a 99-67 victory in the senior basketball, a 4-1 win in the junior football, and a 7-0 drubbing in the senior football, while the hockey team cruised to a 6-1 win.
Southland had a win in the junior basketball (67-55), and its second XV won 24-10.