user: Question: Which year had 0 points and an AGS JH23B chassis?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1984.0, 'Equipe Renault Elf', 'Renault RE50', 'Renault V6', 0.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Points" = 0.0 AND "Chassis" = 'AGS JH23B';