user: Question: Who was the opponent at the game with a result of W 26-20?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 11, 1966', 'Cleveland Browns', 'L 38-14', '48,643']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'W 26-20';