On what surface was the Australian Open (6) played on?
CREATE TABLE table_29163303_1 (surface VARCHAR, championship VARCHAR)
SELECT surface FROM table_29163303_1 WHERE championship = "Australian Open (6)"
### Context: CREATE TABLE table_29163303_1 (surface VARCHAR, championship VARCHAR) ### Question: On what surface was the Australian Open (6) played on? ### Answer: SELECT surface FROM table_29163303_1 WHERE championship = "Australian Open (6)"