How many opponents did they play on 17/05/2009?
CREATE TABLE table_21378160_2 (opponent VARCHAR, date VARCHAR)
SELECT COUNT(opponent) FROM table_21378160_2 WHERE date = "17/05/2009"
### Context: CREATE TABLE table_21378160_2 (opponent VARCHAR, date VARCHAR) ### Question: How many opponents did they play on 17/05/2009? ### Answer: SELECT COUNT(opponent) FROM table_21378160_2 WHERE date = "17/05/2009"