Table:
0
A
B
C
D
E
F
G
1
Outcome
Year
Championship
Surface
Partner
Opponents in the final
Score in the final
2
Winner
1968
French Open
Clay
Jean-Claude Barclay
Billie Jean King Owen Davidson
6–1, 6–4
3
Runner-up
1969
French Open
Clay
Jean-Claude Barclay
Margaret Court Marty Riessen
6–3, 6–2
4
Runner-up
1969
US Open
Grass
Dennis Ralston
Margaret Court Marty Riessen
6–4, 7–5
5
Runner-up
1970
French Open
Clay
Jean-Claude Barclay
Billie Jean King Bob Hewitt
3–6, 6–4, 6–2
6
Winner
1971
French Open
Clay
Jean-Claude Barclay
Winnie Shaw Thomas Lejus
6–2, 6–4
7
Runner-up
1972
French Open
Clay
Jean-Claude Barclay
Evonne Goolagong Cawley Kim Warwick
6–2, 6–4
8
Winner
1973
French Open
Clay
Jean-Claude Barclay
Betty Stöve Patrice Dominguez
6–1, 6–4

Questions and formulas:
Question: Who were Dürr's opponents in the final on year 1968?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1=1968),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G8,B2:B8=1968),6))
Level: medium
Question: What was the court surface on year 1971?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1=1971),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G8,B2:B8=1971),4))
Level: medium