Table:
0
A
B
C
D
E
1
Date
Opponent
Score
Loss
Save
2
April 9
Pirates
2 - 1
Rhoden (0-1)
Smith (1)
3
April 11
Pirates
4 - 1
DeLeón (0-1)
|| 10,049 ||2-0||
4
April 12
Expos
5 - 1
Eckersley (0-1)
|| 14,337 ||2-1||
5
April 13
Expos
8 - 3
Rogers (0-2)
|| 32,212 ||3-1||
6
April 14
Expos
4 - 2
Palmer (0-1)
|| 31,512 ||4-1||
7
April 15
Phillies
2 - 1
K. Gross (0-1)
Smith (2)
8
April 16
Phillies
1 - 0 10
Holland (0-1)
|| 11,937 ||6-1||
9
April 17
Phillies
5 - 4
K. Gross (0-2)
Smith (3)
10
April 19
@ Expos
5 - 3
Sutcliffe (2-1)
Reardon (2)
11
April 20
@ Expos
4 - 0
Trout (2-1)
Reardon (3)
12
April 21
@ Expos
4 - 0
Palmer (0-2)
|| 13,506 ||8-3||
13
April 22
@ Pirates
5 - 3
Ruthven (0-1)
Candelaria (3)
14
April 23
@ Pirates
5 - 0
Bielecki (1-1)
|| 9,387 ||9-4||
15
April 24
@ Pirates
5 - 2
Rhoden (0-3)
Smith (4)
16
April 26
@ Phillies
7 - 3
Koosman (0-1)
|| 27,187 ||11-4||
17
April 27
@ Phillies
6 - 1
Sanderson (1-1)
|| 25,220 ||11-5||
18
April 28
@ Phillies
3 - 2
Sutcliffe (3-2)
Andersen (2)
19
April 30
Giants
3 - 1
Laskey (0-3)
Smith (5)

Questions and formulas:
Question: What were the opponents from the April 13?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="april 13"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E19,A2:A19="april 13"),2))
Level: medium
Question: What is the opponent from April 19?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="april 19"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E19,A2:A19="april 19"),2))
Level: medium