DLS Method In Cricket
As an outdoor sport, interruptions are not uncommon in cricket. Rain, bad light and unsafe pitches are common occurrences. Rather than ending the match abruptly and declaring it inconclusive, umpires deploy the DLS method.
The DLS method allows both teams to be judged fairly when overs are limited during a match. For fans and bettors alike who are not familiar with this system, this blog explains everything they need to know. We cover how the DLS method works, when it is used, and how it is calculated. We also use real-life examples to give them an overview of the entire system.
DLS Full Form - Duckworth-Lewis-Stern Method
Also known as the Duckworth-Lewis-Stern method, the abbreviation DLS method levels the playing field between two teams in the event of an interruption. It is a mathematical system umpires use to determine targets and results when the overs in a match are limited due to interruptions.
The Duckworth-Lewis method is a common system used in cricket events with a fixed number of overs. It's often seen in the following events.
One Day Internationals (ODIs) - 50 overs per side
T20 Internationals - 20 overs per side
Champions Trophy
ICC Men's Cricket World Cup - 50 overs per side
ICC Women's Cricket World Cup - 50 overs per side
ICC T20 Men's World Cup - 20 overs per side
ICC T20 Women's World Cup - 20 overs per side
Limited-overs domestic matches
Despite bringing fairness, the DLS method is not used in Test cricket because its overs are not fixed. Teams bat until the innings are declared or all 10 wickets fall. Additionally, time interruptions don't change the target in Test cricket. Therefore, the DLS method is not needed here.
DLS Meaning in Cricket Explained
So, what is DLS in cricket? Used in limited-overs cricket, the Duckworth-Lewis-Stern method calculates revised targets when interruptions such as rain disrupt a match. It's a mathematical formula that uses each team's available resources to recalculate a fair target and level the playing field for both teams.
In the DLS method, the batting team's scoring ability is calculated using two main resources.
Wickets remaining
Overs left
The umpires then use the official DLS resource tables to determine the team’s target adjustment, ensuring it is fair to the other team.
For instance, Team A scores 250 from 50 overs, and rain suddenly starts when Team B is batting. The umpire may reduce Team B's innings to 40 overs due to rain. Team B's targeted score will be calculated according to the overs available and remaining wickets. So, if Team B's available resources are around 86%, the par score will be 250 × 86% = 215. Therefore, rather than needing 251 to win, Team B needs to score 216 to beat Team A.
When using the DLS method, the revised target is updated at every interruption. Therefore, the DLS recalculates targets multiple times to set the target for the batting team. If the match is permanently halted, the umpires decide the result based on whether the batting team is ahead or behind the revised targets. It is one of the methods used to settle cricket matches, and most betting sites, including 1xBet, offer betting markets for this method. They list it under pre-match and live betting cricket events.
However, DLS in cricket applies not only to the second inning but also to the first inning. If rain suddenly interrupts when Team A is batting, they cannot complete their overs. The umpire will then apply the DLS method to set a fair target for Team B. Since Team B have more resources with 10 wickets and 50 overs, their target will increase based on Team A’s run score.
Why Was the DLS Method Created?
To put it simply, the DLS method was created to address controversies arising from interruptions during matches. Before DLS was adopted in 1999, the previous rules meant for addressing interruptions were grossly unfair. Many rules were adopted, with umpires mostly guessing by reducing the target proportionally, leaving one team unfairly disadvantaged and the other unfairly advantaged.
The most popular of these rules was the average run rate method. This rule suggested that if Team A scored 250 runs in 50 overs, the average was 5 runs per over. Therefore, Team B needed to score 126 runs if their innings was reduced to 25 overs (5×25 + 1).
The previous methods were flawed because they ignored the advantage of having wickets left. This was absurd because cricket is a sport where preserving wickets allows teams to bat aggressively later.
The breaking point was in the 1992 Cricket World Cup when South Africa crashed out against England due to ridiculous calculations. South Africa needed 22 runs from 13 balls while having wickets in hand. This target was reduced to 21 runs from 1 ball due to a brief interruption caused by rain. It was mathematically impossible for South Africa to achieve this target and were eliminated as a result.
This led to a major resolution to interruptions caused in cricket. Statisticians Frank Duckworth and Tony Lewis came to the rescue by developing the Duckworth-Lewis method in the mid 1990s. They analysed historical data on how teams scored runs and discovered that overs and wickets were super important. The method was officially adopted by the ICC in 1999 and eliminated much of the guesswork. However, it became Duckworth-Lewis-Stern in 2014 after Professor Steven Stern, an Australian statistician, began managing and updating the formula following the retirement of Duckworth and Lewis.
How Does the DLS Method Work?
Although it looks complicated, the DLS method is really simple. It's based on using two resources (overs left and wickets remaining) to calculate a fair target for the batting team.
Once an interruption occurs, the umpires determine the number of overs to be lost by the batting team based on the time remaining in the match, ground and light conditions, and the minimum overs requirement. They then use the standard DLS resource percentage table to calculate the fair target for the batting team. Here is a sample of how the standard table looks.
100% resources = 50 overs remaining and 10 wickets in hand.
66% resources = 25 overs remaining and 10 wickets in hand.
44% resources = 25 overs remaining and 5 wickets in hand.
15% resources = 10 overs remaining and 2 wickets in hand.
At every international cricket match, the umpires have an official DLS software with precalculated tables. All they need to do when an interruption occurs is enter the wickets lost, overs bowled, current score, and revised overs available. The software will instantly calculate the new target.
Depending on the percentage resource used by the other team, the batting team's run target is calculated. If the interruption occurs in the first innings, i.e., when the first team is batting, the umpires automatically calculate the target assuming the second team has 100% resources. More explanation is provided in subsequent sections below.
DLS Method Resources - Overs & Wickets
The purpose of the DLS method is to ascertain fairness in case of interruption caused by rain, waterlogged pitches, weather delays or bad lights. It treats cricket as a resource-management game by using two resources to calculate targets and outcomes. Each team's scoring ability depends on two main resources.
Overs left: How many balls do they have left to face
Wickets remaining: The number of batters they have left
The more overs and wickets left for a team, the better their chances of scoring more. As a result, teams with more wickets tend to bat more aggressively while those with fewer wickets play more defensively. Also, losing wickets and overs reduces a team's scoring potential.
Resources (overs left and wickets remaining) are measured as a percentage. A team has 100% resources when they have 50 overs and 10 wickets left. The resource percentage reduces as wickets fall and overs are used. For instance, the resource percentage may drop to around 15% after 40 overs have been used and 8 wickets have fallen. This means there are 10 overs left and 2 wickets in hand.
How DLS is Calculated - Simplified Explanation
The DLS method can be quite complicated, especially for bettors who are new to cricket betting in India. However, they don't have to worry because it's particularly straightforward. The good part is that neither the umpires, players, nor fans need to understand the complex mathematics involved. Therefore, bettors can focus on markets such as revised target bets, match results with DLS factored in, and DLS-applied or rain rules.
For those who want to know how the targets are calculated, here is how it works with a simple example.
If Team A scores 225 runs from 50 overs.
Rain reduces Team B's overs to 40 overs.
That means Team B now has 40 overs and 10 wickets, which is around 90% of the resources.
That means the revised target will be 90% of Team A's runs (225) = 202.5.
Team B's revised target is 203. If they score a minimum of 203 from 40 overs, they win.
What if the rain happens after they've started batting?
Rain started, and the umpire reduced their overs by 10, so the total overs will be 50 - 10 = 40.
Having already played 15 overs, they have 25 overs and 5 wickets left, which equals 44% of their resources.
If the match couldn't be continued, the par score would be calculated.
Team B already used 56% of their resources (100% - 44% resources left)
The par score will be 56% of Team A's score (225) = 126.
Team B needed to have scored 127 to win.
If Team B scored 130 from their 15 overs, they won.
If they scored 115 from their 15 overs, they lost, and Team A won.
When is the DLS Method Used?
The DLS method is designed for specific moments during a cricket match. When interruptions reduce overs, umpires use the DLS method to ensure a fair playing field for both teams. Therefore, the DLS method is used for limited-overs cricket. It's used only if an interruption causes overs to be lost.
Below are some of the causes of overs loss.
Rain
Waterlogged and flooded pitches
Bad light
Heavy dew
Strong wind
Storm and lightning
Overs are reduced in cricket matches like ODIs and T20s because they work according to schedules. Once the umpires detect that time will not be enough to cover all overs, they'll reduce the overs. Therefore, the DLS method is used to ensure fairness between both teams.
DLS Method Examples - Famous Matches
The DLS method was adopted by the ICC in 1999 and has been used ever since. While it has been modified to suit T20 rules, the concept still remains the same. Here are some of the famous matches where the DLS method was used.
2009 ODI - West Indies vs England
England beat the West Indies by 1 run under the DuckworthLewis method after West Indies coach John Dyson mistakenly called his players in due to bad light.
England scored 270/7 while West Indies had 244/7. West Indies needed 2 more runs, but Dyson thought his side had done enough to win the match. They accepted the bad light offer from the umpire and walked off the pitch, thereby surrendering victory to England.
2003 World Cup - Sri Lanka vs South Africa
This was a heartbreak for South Africa because they didn't know they needed 1 more run to win. They were chasing 269 in the match, but rain interrupted after 45 overs with 229/6. The DLS par score at that moment was 229, and they tied the match. Mark Boucher thought they had won and defensively played out the last ball to mid-wicket without taking a run. South Africa was eliminated on net run rate since they needed 230 to win.
2023 IPL Final - Chennai Super Kings vs Gujarat Titans
The Chennai Super Kings (CSK) won their 5th IPL title after rain reduced their overs to 15, setting a revised target of 171. The Gujarat Titans had 214/4 in 20 overs, but CSK won by 5 wickets, 171/5.
