user: Question: On what Year did Entrant Leyton House have a Chassis type of Leyton House CG911?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1985.0, 'Tyrrell Racing Organisation', 'Tyrrell 014', 'Renault V6 (t/c)', 3.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Entrant" = 'Leyton House' AND "Chassis" = 'Leyton House CG911';