user: Question: Who was the opponent at the Steelers game that had a result of L 20–17?
Columns: ['Week', 'Date', 'Kickoff ( ET )', 'Opponent', 'Result', 'Record', 'Game Site']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Mon. Sep. 3', '9:00pm', 'at New England Patriots', 'W 16–13 OT', '1–0', 'Schaefer Stadium']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'L 20–17';