Table:
0
A
B
C
D
E
F
G
1
Rank
Margin
Club
Opponent
Year
Round
Venue
2
1
190
Fitzroy
Melbourne
1979
17
VFL Park
3
2
186
Geelong
Melbourne
2011
19
Kardinia Park
4
3
178
Collingwood
St Kilda
1979
4
Victoria Park
5
4
171
South Melbourne
St Kilda
1919
12
Lake Oval
6
5
168
Richmond
North Melbourne
1931
2
Punt Road Oval
7
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.
Source: . Last updated: 20 August 2013.

Questions and formulas:
Question: which round has a margin of 178?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1=178),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G7,B2:B7=178),6))
Level: medium