user: Question: Who did the Seahawks play when the listed attendance was 61615?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 4, 1983', 'at Kansas City Chiefs', 'L 13-17', 'Arrowhead Stadium', '0-1', 42531.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = 61615.0;