Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_41 (points INTEGER, entrant VARCHAR, chassis VARCHAR)
### Question:
What is the sum of all the points won by Peter Whitehead in an alta f2 Chassis?
### Answer:
SELECT SUM(points) FROM table_name_41 WHERE entrant = "peter whitehead" AND chassis = "alta f2"