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_32041 ( "Round" text, "Date(s)" text, "Clubs from the previous round" text, "Clubs involved" real, "Fixtures" real )

### Question ###
In the sixth round, what is the sum of fixtures when there were more than 15 clubs involved?

### Accurate SQL ###

SELECT SUM("Fixtures") FROM table_32041 WHERE "Round" = 'sixth round' AND "Clubs involved" > '15'