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_56 ( goal_difference VARCHAR, points_1 VARCHAR, goals_against VARCHAR )

### Question ###
When the Points 1 was 51 and the Goals Against was less than 66, what was the Goal Difference?

### Accurate SQL ###

SELECT goal_difference FROM table_name_56 WHERE points_1 = "51" AND goals_against < 66