user: Question: Who was the opponent at the game with a result of W 13–12?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Match Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 7, 2008', 'at Pittsburgh Steelers', 'L 38–17', 'Heinz Field', '0–1', 'Recap']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'W 13–12';