user: Question: What was the class when ADT Champion Racing ranked 1st with an Audi R8 chassis, and less than 206 points?
Columns: ['Year', 'Entrant', 'Class', 'Chassis', 'Engine', 'Tyres', 'Rank', 'Points']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1999.0, 'Audi Sport Team Joest', 'LMP', 'Audi R8R', 'Audi 3.6L Turbo V8', 'M', '52nd', 20.0]
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Points" < 206.0 AND "Chassis" = 'Audi R8' AND "Entrant" = 'ADT Champion Racing' AND "Rank" = '1st';