Table:
0
A
B
C
D
E
1
Time
Athlete
Nationality
Location of race
Date
2
20.6y
Andy Stanfield
United States
Philadelphia , United States
May 26, 1951
3
20.6
Andy Stanfield
United States
Los Angeles , United States
June 28, 1952
4
20.6
Thane Baker
United States
Bakersfield , United States
June 23, 1956
5
20.6
Bobby Morrow
United States
Melbourne , Australia
November 27, 1956
6
20.6
Manfred Germar
West Germany
Wuppertal , Germany
October 1, 1958
7
20.6y
Ray Norton
United States
Berkeley , United States
March 19, 1960
8
20.6
Ray Norton
United States
Philadelphia , United States
April 30, 1960
9
20.5y
Peter Radford
United Kingdom
Wolverhampton , United Kingdom
May 28, 1960
10
20.5
Stone Johnson
United States
Stanford , United States
July 2, 1960
11
20.5
Ray Norton
United States
Stanford , United States
July 2, 1960
12
20.5
Livio Berruti
Italy
Rome , Italy
September 3, 1960
13
20.5y
Paul Drayton
United States
Walnut , United States
June 23, 1962
14
20.3y
Henry Carr
United States
Tempe , United States
March 23, 1963
15
20.2y
Henry Carr
United States
Tempe , United States
April 4, 1964
16
20.0y
Tommie Smith
United States
Sacramento , United States
June 11, 1968
17
19.8A
Tommie Smith
United States
Mexico City , Mexico
October 16, 1968
18
19.8A
Donald Quarrie
Jamaica
Cali , Colombia
August 3, 1971
19
19.8+
Donald Quarrie
Jamaica
Eugene, Oregon , United States
June 7, 1975

Questions and formulas:
Question: What's the nationality of Henry Carr having a time of 20.3y?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(B1="henry carr")*(A1="20.3y")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E19,(B2:B19="henry carr")*(A2:A19="20.3y")),3))
Level: medium
Question: What's the nationality of Livio Berruti?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="livio berruti"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E19,B2:B19="livio berruti"),3))
Level: medium
Question: What's the nationality of Ray norton with a time of 20.6?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(A1="20.6")*(B1="ray norton")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E19,(A2:A19="20.6")*(B2:B19="ray norton")),3))
Level: medium