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 ( goals_against INTEGER, goals_for VARCHAR, points VARCHAR, wins VARCHAR )

### Question ###
How many goals against were scored when the points were smaller than 13, the wins were smaller than 3, and the goals for were smaller than 15?

### Accurate SQL ###

SELECT SUM(goals_against) FROM table_name_73 WHERE points < 13 AND wins < 3 AND goals_for < 15