user: Question: what is the engine that saw 0 points, and a Chassis of Porsche 718, in 1961?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1957.0, 'Ecurie Maarsbergen', 'Porsche 550RS', 'Porsche Flat-4', 0.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Points" = 0.0 AND "Chassis" = 'Porsche 718' AND "Year" = 1961.0;