Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What opponent had a game with more than 50,705 in attendace on September 13, 1982?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']

### Response:
SELECT Opponent FROM table WHERE Attendance > 50,705 AND Date = september 13, 1982