user: Question: Who did the Chiefs play at the game attended by 34,063?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 11, 1966', 'at Buffalo Bills', 'W 42–20', '42,023']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '34,063';