Table:
0
A
B
C
D
E
F
1
Year
Division
League
Regular Season
Playoffs
Open Canada Cup
2
2000
4
USL PDL
6th, Heartland
Did not qualify
Did not participate
3
2001
4
USL PDL
4th, Heartland
Did not qualify
Did not participate
4
2002
4
USL PDL
6th, Heartland
Did not qualify
Did not participate
5
2003
4
USL PDL
4th, Heartland
Did not qualify
Did not participate
6
2004
4
USL PDL
4th, Heartland
Did not qualify
Did not participate
7
2005
4
USL PDL
4th, Heartland
Did not qualify
Did not participate
8
2006
4
USL PDL
7th, Heartland
Did not qualify
Did not participate
9
2007
4
USL PDL
1st, Heartland
Conference Semi-Finals
Did not participate
10
2008
4
USL PDL
1st, Heartland
Champions
N/A
11
2009
4
USL PDL
2nd, Heartland
Divisional Semi-Finals
N/A
12
2010
4
USL PDL
1st, Heartland
National Final
N/A
13
2011
4
USL PDL
1st, Heartland
National Semi-Finals
N/A
14
2012
4
USL PDL
1st, Heartland
Conference Semi-Finals
N/A
15
2013
4
USL PDL
1st, Heartland
National Final
N/A

Questions and formulas:
Question: Which league's playoffs was national semi-finals?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="national semi-finals"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,E2:E15="national semi-finals"),3))
Level: medium