Table:
0
A
B
C
D
E
F
G
1
Team
Outgoing manager
Manner of departure
Date of vacancy
Replaced by
Date of appointment
Position in table
2
Bournemouth
Kevin Bond
Contract terminated
1 September 2008
Jimmy Quinn
2 September 2008
23rd
3
Grimsby Town
Alan Buckley
Contract terminated
15 September 2008
Mike Newell
6 October 2008
20th
4
Port Vale
Lee Sinnott
Mutual consent
22 September 2008
Dean Glover
6 October 2008
16th
5
Chester City
Simon Davies
Contract terminated
11 November 2008
Mark Wright
14 November 2008
19th
6
Barnet
Paul Fairclough
Resigned
28 December 2008
Ian Hendon
21 April 2009
16th

Questions and formulas:
Question: At what date did the 23rd manager vacate the position?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,G1="23rd"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,G2:G6="23rd"),4))
Level: medium
Question: What was the date of appointment for the manager that replaced Simon Davies? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1="Simon Davies"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,B2:B6="Simon Davies"),6))
Level: medium
Question: What was the date of appointment for the manager of the 23rd team?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,G1="23rd"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,G2:G6="23rd"),6))
Level: medium
Question: How many categories for, replaced by, exist when the outgoing manager is Alan Buckley? 
Formula: ROWS(UNIQUE(FILTER(E1, B1="Alan Buckley")))
Formula2: ROWS(UNIQUE(FILTER(E2:E6, B2:B6="Alan Buckley")))
Level: medium