Twenty20 (T20) is a shortened game format of cricket. At the professional level, it was introduced by the England and Wales Cricket Board (ECB) in 2003 for the inter-county competition.[1] In a Twenty20 game, the two teams have a single innings each, which is restricted to a maximum of 20 overs. Together with first-class and List A cricket, Twenty20 is one of the three current forms of cricket recognised by the International Cricket Council (ICC) as being at the highest international or domestic level.
A typical Twenty20 game is completed in about three hours, with each innings lasting around 90 minutes and an official 10-minute break between the innings. This is much shorter than previous forms of the game, and is closer to the timespan of other popular team sports. It was introduced to create a fast-paced game that would be attractive to spectators at the ground and viewers on television.
The game has succeeded in spreading around the cricket world. On most international tours there is at least one Twenty20 match and all Test-playing nations have a domestic cup competition. Australia are currently the defending world champions, after winning the 2021 World Cup.
Every two years an ICC World Twenty20 tournament is to take place, except in the event of an ICC Cricket World Cup being scheduled in the same year, in which case it will be held the year before. The first tournament was in 2007 in South Africa where India defeated Pakistan in the final. Two Associate teams had played in the first tournament, selected through the 2007 ICC World Cricket League Division One, a 50-over competition. In December 2007 it was decided to hold a qualifying tournament with a 20-over format to better prepare the teams. With six participants, two would qualify for the 2009 World Twenty20 and would each receive $250,000 in prize money. The second tournament was won by Pakistan, who beat Sri Lanka by eight wickets in England on 21 June 2009. The 2010 ICC World Twenty20 tournament was held in the West Indies in May 2010, where England defeated Australia by seven wickets. The 2012 ICC World Twenty20 was won by the West Indies, by defeating Sri Lanka at the finals. It was the first time in cricket history when a T20 World Cup tournament took place in an Asian country. The 2014 ICC World Twenty20 was won by Sri Lanka, by defeating India at the finals, where the tournament was held in Bangladesh. The 2016 ICC World Twenty20 was won by West Indies. In July 2020, the ICC announced that both the 2020 and 2021 editions had been postponed by one year due to the COVID-19 pandemic.In June 2021, the ICC expanded the Twenty20 World Cup from 16 to 20 teams starting from the 2024 edition onwards.
Each bowler may bowl a maximum of only one-fifth of the total overs per innings. For a full, uninterrupted match, this is four overs.
If a bowler delivers a no-ball by overstepping the crease, it costs one or two runs (depending on the competition) and their next delivery is designated a "free-hit". In this circumstance the batter can only be dismissed through a run out, hitting the ball twice or obstructing the field.
The following fielding restrictions apply:
No more than five fielders can be on the leg side at any time.
During the first six overs, a maximum of two fielders can be outside the 30-yard circle (this is known as the powerplay).
After the first six overs, a maximum of five fielders can be outside the fielding circle.
If the fielding team does not start to bowl their 20th over within 75 minutes, the batting side is credited an extra six runs for every whole over bowled after the 75-minute mark; the umpire may add more time to this if they believe the batting team is wasting time.
Currently, if the match ends with the scores tied and there must be a winner, the tie is broken with a one-over-per-side Eliminator or Super Over:Each team nominates three batsmen and one bowler to play a one-over-per-side "mini-match". The team which bats second in the match bats first in the Super Over. In turn, each side bats one over bowled by the one nominated opposition bowler, with their innings over if they lose two wickets before the over is completed. The side with the higher score from their Super Over wins. If the Super Over also ends up in a tie, it is repeated until the tie is broken.
In the Australian domestic competition the Big Bash League, the Super Over is played slightly differently, with no two-wicket limit, and if the Super Over is also tied then a "countback" is used, with scores after the fifth ball for each team being used to determine the result. If it is still tied, then the countback goes to four balls, and so on.The latest Super Over to decide a match was between the Sydney Sixers and the Brisbane Heat on 25 January 2017, in the Big Bash League at the Brisbane Cricket Ground, with the Sixers winning 0/22 to 0/15 in the Super Over after tying on 164.
Tied Twenty20 matches were previously decided by a bowl-out.