Table:
0
A
B
C
D
E
1
Game
Date
Opponent
Score
Series
2
1
April 9
New York Rangers
2–6
Rangers lead 1–0
3
2
April 10
New York Rangers
2–1
Series tied 1–1
4
3
April 12
@ New York Rangers
2–5
Rangers lead 2–1
5
4
April 14
@ New York Rangers
7–1
Series tied 2–2
6
5
April 15
New York Rangers
2–5
Rangers win 3–2

Questions and formulas:
Question: What date has 1 for the game?
Formula: LET(query1,SUMMARIZE(B1,SUMX(A1)),FILTER(query1,CHOOSECOLS(query1,2)=1))
Formula2: LET(query1,SUMMARIZE(B2:B6,SUMX(A2:A6)),FILTER(query1,CHOOSECOLS(query1,2)=1))
Level: hard
Question: What opponent has april 10 as the date?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="april 10"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,B2:B6="april 10"),3))
Level: medium