Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15249 ( "Year" real, "Entrant" text, "Chassis" text, "Engine" text, "Pts." real )

### Question ###
What are the points for a chassis of march 811?

### Accurate SQL ###

SELECT SUM("Pts.") FROM table_15249 WHERE "Chassis" = 'march 811'