What country did Gil play against on 21–23 september 2007?
CREATE TABLE table_18042031_16 (against VARCHAR, date VARCHAR)
SELECT against FROM table_18042031_16 WHERE date = "21–23 September 2007"
### Context: CREATE TABLE table_18042031_16 (against VARCHAR, date VARCHAR) ### Question: What country did Gil play against on 21–23 september 2007? ### Answer: SELECT against FROM table_18042031_16 WHERE date = "21–23 September 2007"