Rain has a funny way of ruining a perfectly good cricket match. One minute you're watching a tense ODI, the next the covers are on and everyone's refreshing their phone wondering — will the match even resume? And if it does, what's the target now? That's where the Duckworth–Lewis–Stern method steps in, and honestly, it's one of cricket's most misunderstood — yet brilliant — inventions.
So What Exactly Is the DLS Method?
The Duckworth–Lewis–Stern method (commonly called DLS) is a mathematical formula used to recalculate target scores in limited-overs cricket when matches are interrupted — usually by rain. It was developed by two English statisticians, Frank Duckworth and Tony Lewis, in the late 1990s. Professor Steven Stern later revised and maintained the system, which is why his name was added in 2014.
Here's the thing — before DLS, rain interruptions were handled with far simpler (and frankly, unfair) methods. The Most Productive Overs method, for instance, could drastically favor one team depending on when the rain hit. A team defending a target could "benefit" from rain at the worst possible moment for the chasing side. DLS was designed to fix that.
The Core Idea: Resources
The genius of DLS lies in one central concept — resources. Every cricket team batting has two resources at their disposal: overs remaining and wickets in hand. The DLS model assigns a percentage value to these combined resources at any point in an innings.
Think of it like a fuel gauge. A team starting their innings has 100% of their resources. As they face overs and lose wickets, that percentage drops. When rain interrupts play, DLS calculates how many resources each team had — and adjusts the target accordingly.
| Overs Remaining | Wickets Lost | Resources Remaining (%) |
|---|---|---|
| 50 | 0 | 100.0% |
| 40 | 0 | 90.3% |
| 30 | 2 | 72.5% |
| 20 | 4 | 52.4% |
| 10 | 6 | 26.1% |
| 5 | 8 | 8.7% |
Note: Values are approximate and simplified for illustration.
How the Calculation Actually Works
Let me explain with a simple example. Say Team A bats first and scores 280 in 50 overs. Rain interrupts before Team B starts. Officials decide only 40 overs are now available.
Team A had 100% resources. Team B, starting with 40 overs and 10 wickets, has roughly 90.3% resources. So Team B's target is adjusted:
Revised Target = Team A's Score × (Team B's Resources ÷ Team A's Resources)
280 × (90.3 ÷ 100) = approximately 253 runs.
Now flip the scenario — rain interrupts during Team B's chase. This is where it gets more complex, because wickets lost matter enormously. That's why you'll sometimes see a revised target jump or change dramatically mid-innings; it's not random, it reflects the shifting resource balance.
Why Do People Find It Confusing?
You know what? The confusion is completely understandable. The full DLS model uses a complex exponential decay formula with multiple parameters — not something you'd scribble on a napkin. Even seasoned cricket fans find revised targets baffling in real time.
Part of the issue is that scoreboard graphics rarely explain why a target changed. You just see "Target: 187 (D/L)" flash up, and you're left wondering how they got there. Broadcasters are getting better at explaining it, but there's still a gap.
Another reason people struggle — DLS treats every match situation differently. Two matches with the same interruption at the same over can produce different revised targets if the wicket situation differs. That precision is exactly what makes it fair, but it also makes it harder to intuit.
Has It Always Been Perfect?
Honestly, no. DLS has faced criticism, particularly in T20 matches. The model was originally calibrated for 50-over cricket, and applying it to the shorter format sometimes produces targets that feel off. The ICC and Professor Stern have worked on recalibrations specifically for T20s, but debates still flare up after controversial rain-affected results.
The 2019 Cricket World Cup semi-final between India and New Zealand — stretched across two days due to rain — reignited conversations about whether DLS is fully suited for knockout matches. It works, but it's not perfect.
When Is DLS Applied?
DLS applies whenever a rain interruption affects the number of overs available to either team. It is not used for interruptions within the first innings that don't reduce overs, or for other weather delays that don't change the total overs available.
The third umpire and match referee consult with the DLS calculator (official software maintained by the ICC) to determine revised targets in real time.
Frequently Asked Questions (FAQs)
Q: What does D/L or DLS mean next to a score? It means the match result or target was calculated using the Duckworth–Lewis–Stern method due to a weather interruption.
Q: Is DLS used in T20 cricket? Yes, DLS applies to T20 internationals and most T20 domestic tournaments, though its accuracy in the shortest format has been debated.
Q: Who maintains the DLS method today? Professor Steven Stern of Bond University, Australia, currently maintains and updates the DLS model on behalf of the ICC.
Q: Can a team win by DLS method without completing their innings? Yes. If rain stops play mid-chase and the batting team's score surpasses their DLS target at that point, they win.
Q: Why does the DLS target sometimes seem very low? The target accounts for lost overs and wickets in hand. If overs are heavily reduced, the target can drop significantly — which sometimes feels counterintuitive but is mathematically sound.
Q: Is there a simpler alternative to DLS? None that are widely accepted. The ICC has endorsed DLS as the most equitable method available for interrupted matches.