Rain Delays in Cricket: How the DLS Method Handles Interrupted Matches
Rain interruptions are cricket's most complex officiating challenge — how do you fairly determine a result when a limited-overs match is cut short? The Duckworth-Lewis-Stern (DLS) method is the mathematical system used to revise targets in rain-affected matches. This guide explains how DLS works.
Limited-overs cricket's most technically complex officiating situation is a rain interruption. Unlike Test cricket (which simply loses rained-out time), ODI and T20 matches have a defined total that the second team must chase — and rain can cut this target's overs. The Duckworth-Lewis-Stern (DLS) method is the ICC's approved mathematical system for revising targets in rain-affected matches, using a formula that accounts for both overs remaining and wickets in hand.
The 1992 World Cup Problem
The inadequacy of pre-DLS rain rules was dramatically exposed in the 1992 World Cup semi-final between England and South Africa. South Africa, chasing 252, needed 22 from 13 balls when rain stopped play. Under the 'most productive overs' rule then in use, South Africa's target was revised to 22 from 1 ball — an impossible task. The result was widely condemned as farcical and accelerated cricket's adoption of a more sophisticated rain-interruption method.
How DLS Works
DLS calculates each team's 'resources' — a percentage value based on overs remaining and wickets in hand. A team with 50 overs remaining and all 10 wickets has 100% resources; as overs are used and wickets fall, resources decline on a non-linear curve. If rain interrupts the second innings (or both innings), DLS compares each team's resources at the interruption point and adjusts the target proportionally. The formula ensures that a team batting second doesn't gain an advantage from being left chasing a reduced target in fewer overs than they would need to score it.
DLS Controversies
DLS is mathematically sophisticated but produces outcomes that can seem counterintuitive. In high-scoring T20 matches, DLS sometimes produces revised targets that feel too easy for the team batting second. In rain-shortened ODIs, aggressive batting in the first innings (which may have pushed the run rate at the expense of wickets) can disadvantage the team that set the target if rain reduces the second innings. These perceived anomalies are why many cricket fans remain confused or frustrated by DLS outcomes, even when the mathematics is correctly applied.
Frequently asked questions
What is the DLS method in cricket?
The Duckworth-Lewis-Stern (DLS) method is a mathematical system used to set revised targets in rain-affected limited-overs cricket matches. It calculates each team's 'resources' (based on overs remaining and wickets in hand) and adjusts targets proportionally when overs are lost due to weather. DLS was first used in 1997 and became cricket's official rain rule for ODIs and T20Is.
Why was DLS invented?
DLS was invented because previous rain rules produced unfair outcomes — most famously in the 1992 World Cup semi-final when South Africa needed 22 runs off 1 ball after a rain interruption. The old 'most productive overs' rule failed to account for the value of wickets in hand. DLS addresses this by modelling both overs remaining and wickets remaining as joint resources.
Does the DLS method apply in Test cricket?
No — DLS applies only to limited-overs cricket (ODIs and T20Is). In Test cricket, rain simply reduces the time available for play, and no revised targets are set. If a Test loses too many overs to rain, it is drawn. The reserve day provision (in ICC events) can allow play to continue if weather permits.