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_33 ( goals_against_average INTEGER, games_played INTEGER )

### Question ###
What is the average goals against average for those playing more than 78 games?

### Accurate SQL ###

SELECT AVG(goals_against_average) FROM table_name_33 WHERE games_played > 78