user: Question: Who was the opponent at the game with a result of W 20-17?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Venue', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 17, 1972', 'at Cleveland Browns', 'W 26-10', 'Cleveland Stadium', 75771.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'W 20-17';