Table:
0
A
B
C
D
E
F
G
1
Home team
Home team score
Away team
Away team score
Venue
Crowd
Date
2
Melbourne
21.15 (141)
St Kilda
31.18 (204)
MCG
24,852
6 May 1978
3
Geelong
12.16 (88)
North Melbourne
16.14 (110)
Kardinia Park
23,074
6 May 1978
4
Essendon
22.18 (150)
Richmond
19.15 (129)
Windy Hill
21,946
6 May 1978
5
Carlton
19.12 (126)
Hawthorn
24.13 (157)
Princes Park
19,464
6 May 1978
6
Fitzroy
14.12 (96)
Collingwood
22.16 (148)
Junction Oval
25,282
6 May 1978
7
South Melbourne
18.15 (123)
Footscray
16.9 (105)
VFL Park
19,263
6 May 1978

Questions and formulas:
Question: Which date did richmond play as away?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,C1="richmond"),7))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G7,C2:C7="richmond"),7))
Level: medium