Table:
0
A
B
C
D
E
F
G
1
Game
October
Opponent
Score
Location/Attendance
Record
Points
2
1
7
@ Pittsburgh Penguins
3 – 2
Consol Energy Center (18,289)
1–0–0
2
3
2
9
@ St. Louis Blues
1 – 2 (OT)
Scottrade Center (19,150)
1–0–1
3
4
3
11
Colorado Avalanche
4 – 2
Wells Fargo Center (19,652)
2–0–1
5
5
4
14
Tampa Bay Lightning
2 – 3
Wells Fargo Center (19,592)
2–1–1
5
6
5
16
Pittsburgh Penguins
1 – 5
Wells Fargo Center (19,684)
2–2–1
5
7
6
21
Anaheim Ducks
2 – 3
Wells Fargo Center (19,012)
2–3–1
5
8
7
23
Toronto Maple Leafs
5 – 2
Wells Fargo Center (19,382)
3–3–1
7
9
8
25
@ Columbus Blue Jackets
1 – 2
Nationwide Arena (11,727)
3–4–1
7
10
9
26
Buffalo Sabres
6 – 3
Wells Fargo Center (19,361)
4–4–1
9
11
10
29
@ Pittsburgh Penguins
3 – 2
Consol Energy Center (18,275)
5–4–1
11

Questions and formulas:
Question: How many games did they play on october 9?
Formula: ROWS(UNIQUE(FILTER(C1, B1=9)))
Formula2: ROWS(UNIQUE(FILTER(C2:C11, B2:B11=9)))
Level: medium