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_8 (tries_against INTEGER, tries_for VARCHAR, points_against VARCHAR, points_for VARCHAR)

### Question ###
Which Tries against has Points against larger than 156, and Points for of 127, and Tries for larger than 17?

### Accurate SQL ###

SELECT AVG(tries_against) FROM table_name_8 WHERE points_against > 156 AND points_for = 127 AND tries_for > 17