Table:
0
A
B
C
D
E
F
G
H
I
1
Game
Date
Team
Score
High points
High rebounds
High assists
Location Attendance
Series
2
1
May 23
@ Detroit
W 91–86 (OT)
Dwyane Wade (25)
Udonis Haslem (9)
Dwyane Wade (5)
The Palace of Auburn Hills 22,076
1–0
3
2
May 25
@ Detroit
L 88–92 (OT)
Dwyane Wade (32)
Shaquille O'Neal (17)
Dwyane Wade (5)
The Palace of Auburn Hills 22,076
1–1
4
3
May 27
Detroit
W 98–83 (OT)
Dwyane Wade (35)
Shaquille O'Neal (12)
Antoine Walker , Dwyane Wade (4)
American Airlines Arena 20,245
2–1
5
4
May 29
Detroit
W 89–78 (OT)
Dwyane Wade (31)
Shaquille O'Neal (9)
Dwyane Wade (5)
American Airlines Arena 20,248
3–1
6
5
May 31
@ Detroit
L 78–91 (OT)
Dwyane Wade (23)
Udonis Haslem (10)
Jason Williams (6)
The Palace of Auburn Hills 22,076
3–2

Questions and formulas:
Question: What was the series count at on May 23? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,B1="May 23"),9))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,B2:B6="May 23"),9))
Level: medium