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What is the DLS Method?
The Duckworth-Lewis-Stern (DLS) method adjusts target scores in rain-affected limited-overs matches.
Key facts
- Introduced in 1997 by Duckworth & Lewis
- Updated in 2015 by Steve Stern
- Used in ODIs and T20s to calculate fair targets when overs are lost
Why is DLS Needed?
- Reserve days are not feasible for most matches
- Older methods were unfair and flawed
- DLS adjusts targets based on wickets and overs left
Formula
- Team 2’s revised target = Team 1’s score x (Team 2’s resources/Team 1’s resources)
- It is updated yearly on July 1 to match modern scoring trends
Why Were Older Methods Scrapped?
1. Average Run Rate (ARR) Method
- Ignored wickets lost, favoring the chasing team
- Example: A team at 100/9 could still win if rain stopped play
2. Most Productive Overs (MPO) Method
- Ignored the bowling team’s best overs, favoring the team batting first
- 1992 World Cup semifinal mistake: South Africa needed 22 off 13 balls, rain stopped play, and the revised target became 21 off 1 ball
How DLS Fixes This
- Considers both wickets and overs as resources
- Dynamically adjusts targets based on match data
- Fairer to both teams than older methods
Example
- Team 1 scores 300 in 50 overs (100% resources)
- Team 2 has 30 overs and 7 wickets left (~70% resources)
- New target = 300 x (70/100) = 210 runs
Other Methods
- VJD Method: Used in Indian domestic cricket but not recognised by the ICC
- DL Standard Edition: Outdated, used without computers
Summary
- DLS is the current ICC method for rain-affected matches
- It replaced flawed ARR and MPO methods
- Uses both overs and wickets to adjust targets
- Updated yearly to reflect modern scoring trends