user: Question: Name the chassis of 1961
Columns: ['Year', 'Chassis', 'Engine(s)', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1951.0, 'BRM 15', 'BRM P15 1.5 V16 s', 'D', 'n/a 1']
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Year" = 1961.0;