ICC T20I Championship

ICC T20I Championship
ICC T20 Championship logo
Administrator	International Cricket Council
Format	Twenty20 International
First tournament	2007
Last tournament	ongoing
Tournament format	notional (ongoing points accumulation through all matches played)
Number of teams	18
Current champion	New Zealand (125 rating)
Most successful	Sri Lanka (35 months)

The ICC T20 Championship is an international Twenty20 cricket competition run by the International Cricket Council. The competition is notional in that it is simply a ranking scheme overlaid on the regular T20I match schedule.^[1] After every T20I match, the two teams involved receive points based on a mathematical formula. The total of each team's points total is divided by the total number of matches to give a rating, and all teams are ranked on a table in order of rating.^[2]

Currently, New Zealand leads the ICC T20I Championship.

Qualification

According to the ICC website, "Only teams who have completed at least eight T20 international matches since 1st August between three and four years ago will have their rating above converted into a ranking on the main table." ^[3]

Points calculations

Time period

Each team scores points based on the results of their matches over the last 3−4 years − all matches played in the 12–24 months since the May before last, plus all the matches played in the 24 months before that, for which the matches played and points earned both count half.^[4] Each May, the matches and points earned between 3 and 4 years ago are removed, and the matches and points earned between 1 and 2 years ago switch from 100% weighting to 50% weighting. For example, at May 2014, the matches played between May 2010 and May 2011 were removed, and the matches played between May 2012 and May 2013 switched to 50% weighting (the matches from May 2011 to April 2012 would have already been at 50% following the previous rerating). This happens overnight, so can result in teams changing positions in the ranking table despite not playing.

Find the points earned from a match

Each time two teams play another match, the rankings table is updated as follows, based on the ratings of the teams immediately before they played. To determine the teams' new ratings after a particular match, first calculate the points earned from the match:

If the gap between the ratings of the two teams before the match was less than 40 points, then:

Match result	Points earned
Win	Opponent's rating + 50
Tie	Opponent's rating
Lose	Opponent's rating − 50

If the gap between the ratings of the two teams before the match was at least 40 points, then:

Match result	Points earned
Stronger team wins	Own rating + 10
Weaker team loses	Own rating − 10
Stronger team ties	Own rating − 40
Weaker team ties	Own rating + 40
Stronger team loses	Own rating − 90
Weaker team wins	Own rating + 90

Example

Suppose Team A, with an initial rating of 100, plays Team B. The table shows the points awarded to the two teams for 9 different initial ratings for B (ranging from 20 to 160), and the three possible match results.

Initial ratings		Scenario	Team A wins & Team B loses. Points earned:				Match tied. Points earned:				Team A loses & Team B wins. Points earned:				Total initial ratings	Total points earned (All 3 results)
Team A	Team B	Scenario	Team A		Team B		Team A		Team B		Team A		Team B		Total initial ratings	Total points earned (All 3 results)
100	20	Initial ratings at least 40 points apart	Stronger team wins: Own rating + 10	110	Weaker team loses: Own rating − 10	10	Stronger team ties: Own rating − 40	60	Weaker team ties: Own rating + 40	60	Stronger team loses: Own rating − 90	10	Weaker team wins: Own rating + 90	110	120	120
100	40			110		30		60		80		10		130	140	140
100	60			110		50		60		100		10		150	160	160
100	70	Initial ratings less than 40 points apart	Win: Opponent's rating + 50	120	Lose: Opponent's rating − 50	50	Tie: Opponent's rating	70	Tie: Opponent's rating	100	Lose: Opponent's rating − 50	20	Win: Opponent's rating + 50	150	170	170
100	90			140		50		90		100		40		150	190	190
100	110			160		50		110		100		60		150	210	210
100	130			180		50		130		100		80		150	230	230
100	140	Initial ratings at least 40 points apart	Weaker team wins: Own rating + 90	190	Stronger team loses: Own rating − 90	50	Weaker team ties: Own rating + 40	140	Stronger team ties: Own rating − 40	100	Weaker team loses: Own rating − 10	90	Stronger team wins: Own rating + 10	150	240	240
100	160	Initial ratings at least 40 points apart		190	Stronger team loses: Own rating − 90	70	Weaker team ties: Own rating + 40	140	Stronger team ties: Own rating − 40	120	Weaker team loses: Own rating − 10	90	Stronger team wins: Own rating + 10	170	260	260

This illustrates that:

The winning team earns more points than the losing team. (Unless the ratings are more than 180 apart and the weaker team wins − highly unlikely.)
Winning always earns a team 100 points more than losing, and 50 more than tieing.
The total points earned by the two teams is always the same as the total initial ratings of the two teams.
The points earned by a winning team increases as the initial rating (quality) of the opposition increases, within the constraints of earning at least its own initial rating + 10, and no more than its own initial rating + 90. A winning team therefore always earns more points than its initial rating, increasing its overall average rating.
The points earned by a losing team increases as the initial rating (quality) of the opposition increases, within the constraints of earning at least its own initial rating − 90, and no more than its own initial rating − 10. A losing team therefore always earns fewer points than its initial rating, decreasing its overall average rating.
In a tie, the weaker team usually earns more points than the stronger team (unless the initial ratings are at least 80 apart), reflecting the fact that a tie is a better result for the weaker team than the stronger team. Also, the stronger team will earn fewer points than its initial rating, decreasing its average, and the weaker team more points that its initial rating, increasing its average.
For a given result, the rule of how the two teams' points are calculated changes as the initial ratings change, from being based on teams' own ratings when one team is far stronger, to being based on the opponent's ratings when the teams are closely matched, back to being based on own ratings when the other team is far stronger. However, despite these sudden changes in the rule, the number of points awarded for each result changes smoothly as the initial ratings change.

Find the new ratings

Each team's rating is equal to its total points scored divided by the total matches played. (Series are not significant in these calculations).
Add the match points scored to the points already scored (in previous matches as reflected by the table), add one to the number of matches played, and determine the new rating.
Points earned by teams depend on the opponent's ratings, therefore this system needed to assign base ratings to teams when it started.

Current rankings

ICC T20I Championship
Rank	Team	Matches	Points	Rating
1	New Zealand	13	1625	125
2	England	16	1962	123
3	Pakistan	20	2417	121
4	West Indies	19	2222	117
5	India	19	2183	115
6	South Africa	18	1983	110
7	Australia	13	1431	110
8	Sri Lanka	20	1896	95
9	Afghanistan	25	2157	86
10	Bangladesh	15	1168	78
11	Scotland	11	737	67
12	Zimbabwe	13	842	65
13	United Arab Emirates	16	827	52
14	Netherlands	9	441	49
15	Hong Kong	13	599	46
16	Papua New Guinea	6	235	39
17	Oman	9	235	39
18	Ireland	15	534	36
Reference: ICC rankings for Tests, ODIs, Twenty20 & Women, 9 July 2017
"Matches" is the number of matches played in the 12-24 months since the May before last, plus half the number in the 24 months before that.

Historical ICC T20I Champions

This table lists the teams that have successively held the highest rating since the T20I ranking was introduced.

Country	Start	End	Duration	Cumulative	Highest Rating
England	24 October 2011	8 August 2012 ^[5]	290 Days	290 Days	140
South Africa	9 August 2012	11 September 2012	34 Days	34 Days	137
England	12 September 2012	21 September 2012	10 days	300 Days	130
South Africa	22 September 2012	28 September 2012	7 days	41 Days	134
Sri Lanka	29 September 2012	28 March 2014	546 Days	546 Days	134
India	28 March 2014	3 April 2014	6 days	6 days	130
Sri Lanka	3 April 2014	4 April 2014	1 day	547 Days	131
India	4 April 2014	6 April 2014	2 days	8 days	132
Sri Lanka	6 April 2014	1 May 2014	26 days	573 Days	133
India	1 May 2014	7 September 2014	129 days	137 days	131
Sri Lanka	7 September 2014	10 January 2016	490 days	1063 days	135
West Indies	10 January 2016	31 January 2016	21 days	21 days	118
India	31 January 2016	9 February 2016	9 days	146 days	120
Sri Lanka	9 February 2016	12 February 2016	3 days	1066 days	121
India	12 February 2016	3 May 2016	81 days	227 days	127
New Zealand	4 May 2016	Current	436 days*	436 days*	132

* as of 13th July 2017

References

↑ "Twenty20 rankings launched with England on top". Retrieved 24 October 2011.
↑ "David Richardson previews the release of the Reliance ICC T20I Rankings". Retrieved 24 October 2011.
↑ "ICC rankings for Tests, ODIs and Twenty20". Retrieved 5 January 2015.
↑ "FAQs on ICC T20I Team Rankings". Qn4,5, ICC. Retrieved 2016-03-16.
↑ "England rise to No.1 in ODIs". ESPNcricinfo.

External links

ICC Test, ODI and T20I Championship Rankings

International cricket
International Cricket Council (ICC) ICC Awards ICC members
Forms	Test (women's) One Day International (women's) Twenty20 International (women's)
Global events	World Cup (qualifier) World Twenty20 (qualifier) Women's World Cup (qualifier) Women's World Twenty20 (qualifier) Under-19 World Cup Champions Trophy Intercontinental Cup World Cricket League
Asia	ACC – Asia Cup ACC Trophy (List A) ACC Premier League ACC Twenty20 Cup
Africa	ACA – WCL Africa
Americas	ICC Americas – Americas Championship South American Championship
East Asia and Pacific	EAP – ICC EAP Cricket Trophy (One day) ICC EAP Cricket Trophy (Twenty20)
Europe	ECC – European Championship Women's European Championship

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