Table:
0
A
B
C
D
E
1
Week
Date
Opponent
Result
Attendance
2
1
September 6, 1981
at Los Angeles Rams
W 27–20
63,198
3
2
September 13, 1981
at Cleveland Browns
W 9–3
79,483
4
3
September 20, 1981
Miami Dolphins
L 16–10
47,379
5
4
September 27, 1981
at New York Jets
L 33–17
50,309
6
5
October 4, 1981
Cincinnati Bengals
W 17–10
44,350
7
6
October 11, 1981
Seattle Seahawks
W 35–17
42,671
8
7
October 18, 1981
at New England Patriots
L 38–10
60,474
9
8
October 26, 1981
at Pittsburgh Steelers
L 26–13
52,732
10
9
November 1, 1981
at Cincinnati Bengals
L 34–21
54,736
11
10
November 8, 1981
Oakland Raiders
W 17–16
45,519
12
11
November 15, 1981
at Kansas City Chiefs
L 23–10
73,984
13
12
November 22, 1981
New Orleans Saints
L 27–24
49,581
14
13
November 29, 1981
Atlanta Falcons
L 31–27
40,201
15
14
December 3, 1981
Cleveland Browns
W 17–13
44,502
16
15
December 13, 1981
at San Francisco 49ers
L 28–6
55,707
17
16
December 20, 1981
Pittsburgh Steelers
W 21–20
41,056

Questions and formulas:
Question: Who was the opponent on November 15, 1981?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="november 15, 1981"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E17,B2:B17="november 15, 1981"),3))
Level: medium