What was the location for when the opponent was @ roughriders?
CREATE TABLE table_21761882_4 (location VARCHAR, opponent VARCHAR)
SELECT location FROM table_21761882_4 WHERE opponent = "@ Roughriders"
### Context: CREATE TABLE table_21761882_4 (location VARCHAR, opponent VARCHAR) ### Question: What was the location for when the opponent was @ roughriders? ### Answer: SELECT location FROM table_21761882_4 WHERE opponent = "@ Roughriders"