user: Question: What is Brown Motors best point total using the Offenhauser L4 engine since 1950?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1950.0, 'Brown Motors', 'Kurtis Kraft 2000', 'Offenhauser L4', 0.0]
SQL:

assistant: SELECT MAX("Points") FROM "Table" WHERE "Year" > 1950.0 AND "Engine" = 'Offenhauser L4' AND "Entrant" = 'Brown Motors';