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_name_73 (round INTEGER, opponent VARCHAR)

### Question ###
What is the sum of the rounds of the match with brett chism as the opponent?

### Accurate SQL ###

SELECT SUM(round) FROM table_name_73 WHERE opponent = "brett chism"