ICC T20I Championship
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. 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.
|Administrator||International Cricket Council|
|Tournament format||Notional (ongoing points accumulation through all matches played)|
|Number of teams||84|
|Current champion||Australia (275 rating)|
|Most successful||Sri Lanka (1064 days)|
|Longest continuous champion||Pakistan (824 days)|
|Highest rating||Pakistan (286 rating)|
According to the ICC website, "teams will need to play six matches against other teams in the previous three to four years to remain in the rankings table." 
Parts of this article (those related to new ratings system being introduced) need to be updated.May 2019)(
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. 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 matchEdit
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|
|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|
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.
|Team A loses & Team B wins. Points earned:||Total initial ratings||Total points earned (All 3 results)|
|Team A||Team B||Team A||Team B||Team A||Team B||Team A||Team B|
|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||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||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|
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 tying.
- 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 ratingsEdit
- 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.
|ICC T20I Championship|
|13||United Arab Emirates||23||4,288||186|
|16||Papua New Guinea||21||3,769||179|
|67||Isle of Man||4||79||20|
|Reference: ICC rankings for Tests, ODIs, Twenty20 & Women ICC page, 8 September 2020|
|"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 ChampionsEdit
This table lists the teams that have historically held the highest rating since the T20I ranking was introduced.
|England||24 October 2011||7 August 2012 ||289 days||289 days||140|
|South Africa||8 August 2012||11 September 2012||35 days||35 days||137|
|England||12 September 2012||21 September 2012||10 days||299 days||130|
|South Africa||22 September 2012||28 September 2012||7 days||42 days||134|
|Sri Lanka||29 September 2012||27 March 2014||545 days||545 days||134|
|India||28 March 2014||2 April 2014||6 days||6 days||130|
|Sri Lanka||3 April 2014||3 April 2014||1 day||546 days||131|
|India||4 April 2014||5 April 2014||2 days||8 days||132|
|Sri Lanka||6 April 2014||30 April 2014||25 days||571 days||133|
|India||1 May 2014||6 September 2014||129 days||137 days||131|
|Sri Lanka||7 September 2014||9 January 2016||490 days||1061 days||135|
|West Indies||10 January 2016||30 January 2016||21 days||21 days||118|
|India||31 January 2016||8 February 2016||9 days||146 days||120|
|Sri Lanka||9 February 2016||11 February 2016||3 days||1064 days||121|
|India||12 February 2016||3 May 2016||82 days||228 days||127|
|New Zealand||4 May 2016||31 October 2017||546 days||546 days||132|
|Pakistan||1 November 2017||3 November 2017||3 days||3 days||124|
|New Zealand||4 November 2017||6 November 2017||3 days||549 days||124|
|Pakistan||7 November 2017||2 January 2018||57 days||60 days||124|
|New Zealand||3 January 2018||27 January 2018||25 days||574 days||128|
|Pakistan||28 January 2018||30 April 2020||824 days||884 days||286|
|Australia||1 May 2020||5 September 2020||128 days||128 days||278|
|England||6 September 2020||7 September 2020||2 days||301 days||273|
|Australia||8 September 2020||Present||275|
|Last updated 9 September 2020|
The summary of teams that have held the highest rating by days, are:
|Team||Total Days||Highest Rating|
- ICC Test Championship
- ICC ODI Championship
- List of Twenty20 International Records
- International cricket
- ICC Women's Rankings
- ICC Player Rankings
- "Twenty20 rankings launched with England on top". 24 October 2011. Retrieved 24 October 2011.
- "David Richardson previews the release of the Reliance ICC T20I Rankings". Retrieved 24 October 2011.
- "Australia's men rise to top of Test and T20 cricket rankings". The Guardian. 1 May 2020. Retrieved 2 May 2020.
- "ICC unveils Global Men's T20I Rankings Table featuring 80 teams". Retrieved 3 May 2019.
- "FAQs on ICC T20I Team Rankings". Qn4,5, ICC. Retrieved 16 March 2016.
- "ICC rankings - ICC Test, ODI and Twenty20 rankings". 25 October 2011. Archived from the original on 25 October 2011. Retrieved 16 December 2018.
- "England rise to No.1 in ODIs". ESPNcricinfo.