Duckworth-Lewis-Stern Method Explained — Rain Rules in Cricket
What is the Duckworth-Lewis-Stern (DLS) method? How it sets revised targets in rain-affected cricket matches, why it replaced run rate calculations, and how to understand the numbers.
Frequently asked questions
What is the Duckworth-Lewis method in cricket?
The Duckworth-Lewis-Stern (DLS) method is the mathematical system used to set revised targets when rain or other interruptions reduce the overs in a limited-overs cricket match. It calculates each team's 'resources' (overs and wickets remaining) and adjusts targets so that both teams face equivalent challenges, regardless of when the interruption happens.
Why was the Duckworth-Lewis method introduced?
The DLS method was introduced in 1997 to replace the old 'average run rate' and 'fastest scoring overs' systems that produced unfair results. The most famous failure of the old system was the 1992 World Cup semi-final where South Africa's target after a rain interruption changed from 22 off 13 balls to 22 off 1 ball — a mathematically impossible task.
What is a par score in cricket DLS?
The par score under DLS is the score the batting team needs at any point during their innings to be 'level' with the opposition's DLS-adjusted target — so that if the match ended at that exact moment due to rain, the match would be called a tie. Being above par means you are winning; below par means you are losing if rain stops play.