Table:
0
A
B
C
D
E
1
Date
Visitor
Score
Home
Record
2
May 3
Detroit Red Wings
1–4
Edmonton Oilers
1–0
3
May 5
Detroit Red Wings
3–5
Edmonton Oilers
2–0
4
May 7
Edmonton Oilers
2-5
Detroit Red Wings
2–1
5
May 9
Edmonton Oilers
4–3
Detroit Red Wings
3–1
6
May 11
Detroit Red Wings
4–8
Edmonton Oilers
4–1

Questions and formulas:
Question: Who is the visitor on May 9?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="may 9"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="may 9"),2))
Level: medium