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_81 ( total_as INTEGER, venue VARCHAR, team VARCHAR, opponent VARCHAR )

### Question ###
What is the sum of the total As of team bucheon sk, who had the chunnam dragons as their opponent at the bucheon venue?

### Accurate SQL ###

SELECT SUM(total_as) FROM table_name_81 WHERE team = "bucheon sk" AND opponent = "chunnam dragons" AND venue = "bucheon"