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 (opening INTEGER, stadium VARCHAR, capacity VARCHAR)

### Question ###
What is the average opening at Stadyum Samsun with a capacity smaller than 34,658?

### Accurate SQL ###

SELECT AVG(opening) FROM table_name_20 WHERE stadium = "stadyum samsun" AND capacity < 34 OFFSET 658