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_69621 ( "Year" real, "Entrant" text, "Chassis" text, "Engine" text, "Points" real )

### Question ###
Name the sum of points for chassis of maserati 250f and entrant of officine alfieri maserati

### Accurate SQL ###

SELECT SUM("Points") FROM table_69621 WHERE "Chassis" = 'maserati 250f' AND "Entrant" = 'officine alfieri maserati'