The International Cricket Council's new one-day regulations were given their first airing at Headingley on Thursday. Here, Cricinfo explains the changes.
Powerplay
This refers to the new fielding restrictions rule. In the past, there was a 15-over period at the start of an innings when only two fielders were allowed outside the 30-yard circle. This will now apply to the first 10 overs of every innings, in addition to two blocks of five overs (Powerplays), which will be used at the discretion of the fielding captain.
Powerplay 1 covers the first 10 overs of an innings where the fielding restrictions are exactly the same as per the old ODI rules. Two fielders have to be in close catching position.
Powerplay 2 represents the first block of five overs. The fielding captain has to decide at which point he wishes to implement this rule. He can implement it at any stage in the match, provided he informs the umpire. Only two fielders are allowed outside the 30-yard circle and the two close catchers are not mandatory in this case.
Similarly Powerplay 3 represents the second block of five overs.
The umpire will signal Powerplay by moving his arm in a circular motion.
Supersub
NB The experiment with Supersubs was abandoned in 2006
This refers to the new substitution rule where a player can be replaced at any stage in the match. Unlike a traditional 12th man, the substitute can bat, bowl, field and keep wicket like any other player.
If a player is replaced, the replaced player cannot take any further part in the match as a batsman or a bowler. He can field, if required.
Both players will receive a cap
The two captains must nominate the Supersub the at the toss.
The Supersub can be called upon at the end of an over, fall of wicket, a break in play or even at the start of the match
The role of the Supersub will coincide with that of the player he replaces. For example, if Player X bowls seven overs and is replaced by Player Y, then the latter is entitled to bowl only the remaining quota of overs, which is three. Player Y will continue to field and bat, if required.
Only 11 players can take the field at any given time.
If a batsman is replaced by a Supersub, the scorecard will indicate "Retired Not Out" next to the batsman.
The umpire will indicate the introduction of the Supersub by showing a "T" signal