Table:
0
A
B
C
D
E
F
G
H
I
1
Rnd
Date
Race Name
Length
Track
Location
Type
Pole Position
Winning Driver
2
1
May 24, 1981
Indianapolis 500-Mile Race
mi (km)
Indianapolis Motor Speedway
Speedway , Indiana
Paved oval
Bobby Unser
Bobby Unser
3
2
June 21, 1981
Van Scoy Diamond Mines 500
mi (km)
Pocono International Raceway
Long Pond , Pennsylvania
Paved oval
A. J. Foyt
A. J. Foyt
4
3
August 15, 1981
Tony Bettenhausen 100
mi (km)
Illinois State Fairgrounds
Springfield , Illinois
Dirt oval
Tom Bigelow
George Snider
5
4
August 30, 1981
DuQuoin 100
mi (km)
DuQuoin State Fairgrounds
Du Quoin , Illinois
Dirt oval
Bill Engelhart
Rich Vogler
6
5
September 12, 1981
Hoosier Hundred
mi (km)
grounds Indiana State Fair
Indianapolis , Indiana
Dirt oval
Larry Rice
Larry Rice

Questions and formulas:
Question: Who had the pole position in the August 15, 1981 race? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,B1="August 15, 1981"),8))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,B2:B6="August 15, 1981"),8))
Level: medium
Question: Which track was used on September 12, 1981? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,B1="September 12, 1981"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,B2:B6="September 12, 1981"),5))
Level: medium