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Powerplay tweaks and end of runners

West Indies' tour of Bangladesh, which begins with a Twenty20 on October 11, will be the first international series under the ICC's revised playing conditions

ESPNcricinfo staff
Angelo Mathews and his runner Chamara Kapugedera guide Sri Lanka through the final stages, India v Sri Lanka, 2nd ODI, Nagpur, December 18, 2009

Three's a crowd: there will be no more runners allowed in international cricket  •  AFP

West Indies' tour of Bangladesh, which begins with a Twenty20 on October 11, will be the first international series under the ICC's revised playing conditions, which are effective from October 1. The amendments are only applicable to international cricket.
The ICC's cricket committee had made the recommendations after its meeting in London in May and they were passed by the executive board at the annual general meeting in Hong Kong in June.
Powerplays (ODIs only)
In a full ODI, the teams can take the bowling and batting Powerplays (five overs each) at the start of an over after 15 overs of an innings have been bowled. They must complete the Powerplays by the 40th over, which means the last block of fielding restrictions must begin in the 36th over. The first ten overs will comprise the mandatory Powerplay. This condition will not apply to innings reduced to fewer than 40 overs.
Under the previous playing conditions, teams were allowed to take the bowling and batting Powerplays at any time after the completion of the tenth over of the innings.
Runners (All formats)
A batsman will not be allowed a runner under any circumstances. The batsman can retire hurt and return to bat at a later stage in the innings.
Two new balls per innings (ODIs only)
Each fielding team will be given two new balls to be used in alternate overs, one at each end. The mandatory change of the ball after the 34th over of an innings will not take place anymore.
Obstructing the field (All formats)
If a fielding team appeals and the umpire feels the batsman has significantly changed his direction without probable cause, while running between the wickets, and obstructed an attempt to run him out, the umpire can give the batsman out for obstructing the field. It is not relevant whether a run out would have been affected or not. The on-field umpires are allowed to consult the third umpire in making the decision. The other circumstances in which a batsman can be out obstructing the field are still applicable.
Penalty time (All formats)
This amendment refers to the calculation of the time for which a player cannot bat or bowl because he or she was off the field.
If a player, who still has some unexpired penalty time remaining from a previous absence, is on the field when play is interrupted by bad weather, light or other reasons, the duration of the stoppage will be deducted from the remaining penalty time.
Bowler attempting to run out a non-striker before delivery (All formats)
Previously, the bowler could run out a non-striker backing up only if he did so before entering his delivery stride. This meant that as the bowler's back foot landed, the non-striker could move down the pitch before the bowler delivered the ball.
According to a new playing condition, 42.11, "The bowler is permitted, before releasing the ball and provided he has not completed his usual delivery swing, to attempt to run out the non-striker. Whether the attempt is successful or not, the ball shall not count as one of the over. If the bowler fails in an attempt to run out the non-striker, the umpire shall call and signal dead ball as soon as possible."
The umpires shall deem the bowler to have completed his delivery swing once his bowling arm passes the normal point of ball release.
Extra time to complete a match (Tests only)
According to clause 16.2.2 of the Test match playing conditions: "The umpires may decide to play 15 minutes (a minimum of four overs) extra time at the scheduled lunch or tea interval of any day if requested by either captain if, in the umpires' opinion, it would bring about a definite result in that session. If the umpires do not believe a result can be achieved no extra time shall be allowed.
"If it is decided to play such extra time, the whole period shall be played out even though the possibility of finishing the match may have disappeared before the full period has expired.
"Only the actual amount of playing time up to the maximum 15 minutes extra time by which play is extended on any day shall be deducted from the total number of hours of play remaining, and the following session of play shall be reduced by the amount of time by which play was previously extended under this clause."
Delay of lunch interval when nine wickets down (Tests only)
If a team is nine wickets down at the time of the lunch interval, the break will be delayed by a maximum of 30 minutes. Previously, only tea was delay-able, while lunch was taken even if a team was nine down.
Duration of interval between innings (ODIs only)
The minimum interval for an uninterrupted ODI match has been increased from 20 minutes to 30 minutes.