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_83 ( network VARCHAR, year VARCHAR, colour_commentator_s_ VARCHAR )

### Question ###
For which network was Chris Walby the color commentator after 1990?

### Accurate SQL ###

SELECT network FROM table_name_83 WHERE year > 1990 AND colour_commentator_s_ = "chris walby"