user: Question: Which team did they play at Rich Stadium?
Columns: ['Week', 'Date', 'Kickoff ( ET )', 'TV', 'Opponent', 'Result', 'Record', 'Game Site']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Sun. Sep. 3', '1:00pm', 'NBC', 'at Buffalo Bills', 'W 28–17', '1–0', 'Rich Stadium']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Game Site" = 'Rich Stadium';