user: Question: How many points are there for a mclaren m23 chassis later than 1972?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1965.0, 'Ecurie Tomahawk', 'Lotus 20', 'Ford Straight-4', 0.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Year" > 1972.0 AND "Chassis" = 'mclaren m23';