If I read the Tribune's...

..."Countdown to high school football kickoff" correctly yesterday, Brother Rice was the first team to win the IHSA title with two losses. The Crusaders (11-2) defeated Reavis, 14-0, in the 1981 Class 6A final.

That's interesting, especially when you consider that last year three teams won their championships with at least two losses. Lena-Winslow (11-3) took the 1A crown, Stillman Valley (12-2) won in 3A and Naperville Central (11-3) came out on top in 8A.