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_73 (round INTEGER, opponent VARCHAR)
### Question:
What is the sum of the rounds of the match with brett chism as the opponent?
### Answer:
SELECT SUM(round) FROM table_name_73 WHERE opponent = "brett chism"