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_20 (year_won INTEGER, player VARCHAR, to_par VARCHAR)

### Question ###
What is the average year Rich Beem had a to par less than 17?

### Accurate SQL ###

SELECT AVG(year_won) FROM table_name_20 WHERE player = "rich beem" AND to_par < 17