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_65 (number_of_fixtures INTEGER, round VARCHAR)

### Question ###
What is the sum of Number of fixtures when the rounds shows quarter-finals?

### Accurate SQL ###

SELECT SUM(number_of_fixtures) FROM table_name_65 WHERE round = "quarter-finals"