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Greater Manchester Cricket League

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Rules Section G18 - D/L/S for rain affected matches

GMCL Rules Section G18 as at Oct 2020

18 Duckworth Lewis Stern (D/L/S) scoring for weather interrupted matches

   This section of the rules looks at how the Duckworth Lewis Stern method helps determine results in rain affected matches in GMCL competition

18.1. What is D/L/S?

   18.1.1. D/L/S is a system used in cricket to determine a result to games affected by weather

     18.1.1.1.Duckworth Lewis Stern (D/L/S) is an internationally approved method to determine a result in a weather affected limited over cricket match, based on resources available against runs required and generally considered an accurate way of testing both sides

     18.1.1.2.D/L/S takes into account

       18.1.1.2.1.how many overs have been used up,

       18.1.1.2.2.how many wickets have been lost and

       18.1.1.2.3.also adds different weighting values to overs at different part of the innings

     18.1.1.3.The professional version of D/L/S is built in to the cricHQ app and any third party D/L/S calculation system should not be used

   18.1.2.D/L/S is made up of two elements

     18.1.2.1. A D/L/S Revised Target will be calculated for the team batting second to chase

       18.1.2.1.1. At every occasion where overs are lost due to bad weather during either innings after the start of the match

     18.1.2.2. The D/L/S Par score only comes into play.

       18.1.2.2.1.Where the second innings comes to an early end due to bad weather or bad light after 20 overs or more have been played

 

18.2.How does D/L/S work

   18.2.1.D/L/S Revised Target

     18.2.1.1.Where weather interrupts a match after the start of the game during either or both innings D/L/S will provide a revised target for the team batting second at the resumption of play after each weather break.

       18.2.1.1.1.This is obtained from the cricHQ app by ensuring all breaks in play and overs lost are recorded on the cricHQ app at the time they happen, the Revised Target will be shown when restart is activated after the break between innings on the cricHQ App.

       18.2.1.1.2.The revised target will be a whole number and may be higher or lower than the first innings score.

     18.2.1.2.The D/L/S Revised Target must be posted on the scoreboard throughout the second innings

     18.2.1.3.To win the game the side batting second needs ony to equal the Revised Target.

       18.2.1.3.1.Scoring one less than the Revised Target creates a Tie

   18.2.2.D/L/S Par Score

     18.2.2.1.D/L/S will also provide a “Par Score” on the cricHQ app after every ball bowled in the second innings and displayed on the App

     18.2.2.2.The Par Score should be updated

       18.2.2.2.1.after every ball on electronic scoreboards linked to the app

       18.2.2.2.2.at the end of the over on traditional scoreboards

     18.2.2.3.The Par Score will be a whole number and is calculated to reflect where a team should be with the number of balls used from the number available and from the number of wickets lost to be on target to meet the score needed.

     18.2.2.4.The Par Score will only come into play if the game ends abruptly due to weather or bad light.

       18.2.2.4.1.To determine the result, the actual score and the par score are compared after the outcome of the last ball bowled has been entered into the cricHQ App.

     18.2.2.5.The benefit to both sides is that they can see the trend in where they stand as the Par score changes after each ball or each over

       18.2.2.5.1.but remember that the actual comparison for a result can only be made after the last ball is bowled and not the par at the end of the previous over

   18.2.3.D/L/S examples

     18.2.3.1.These are for guidance only and not to be used in games

       18.2.3.1.1.Where Team A batting first has their innings ended at 25 overs when they are 100 – 2

          18.2.3.1.1.1.They have lost all of their highest scoring overs with lots of wickets available

          18.2.3.1.1.2.Team B batting second will be chasing a Revised Target over 160 if they have 25 overs

      18.2.3.1.2.Where Team A batting first has their innings ended at 25 overs when they are 100 – 8

         18.2.3.1.2.1.They have lost all of their highest scoring overs but also lost most of their wickets

         18.2.3.1.2.2.The side batting second will only be chasing a Revised Target of around 80 if they have 25 overs

         18.2.3.1.2.3.This seems low but after batting poorly, Team A have to bowl better than their opponents to win.

      18.2.3.1.3.Where Team A batting first scores 175 -6 off 50 overs and Team B only has 30 overs after a delay in the restart.

         18.2.3.1.3.1.Team B batting second will be chasing a Revised Target around 130 off 30 overs, the wickets lost in the first innings make no difference to the calculation

      18.2.3.1.4.Where Team A batting first scores 175 -6 off 50 overs and Team B bats 10 overs scoring 50-3 but then lose 20 overs and only has 20 overs available after the restart.

         18.2.3.1.4.1.Team B batting second will be chasing a Revised Target of around 140 off their 30 overs, the wickets lost in the first innings make no difference to the calculation

         18.2.3.1.4.2.The target is higher because of the early loss of wickets

      18.2.3.1.5.Where Team A batting first scores 175 -6 off 50 overs and Team B bats 30 overs scoring 125-3 but then the game is rained off.

         18.2.3.1.5.1.With 3 wickets lost the DLS Par off Team B's 30 overs is 89-3 so they needed 90 to win, so Team B win

      18.2.3.1.6.Where Team A batting first scores 175 -6 off 50 overs and Team B bats 30 overs scoring 125-7 but then the game is rained off.

         18.2.3.1.6.1.With 7 wickets lost the DLS Par off Team B's 30 overs is 137-7 so they needed 138 to win, so Team A win.

18.3.How is D/L/S operated

   18.3.1.cricHQ scoring

       18.3.1.1.D/L/S relies on the scorer correctly entering all match delays and interruptions and accurately recording the game scores.

         18.3.1.1.1.If the scorers do not correctly record interruptions at any point of the game for any interruption, the Revised Targets and Par Score will be wrong.

         18.3.1.1.2.It is imperative that the Umpires communicate with scorers to verify overs lost and check that the scoring app has been updated before every restart.

   18.3.2.Scoreboard requirements

       18.3.2.1.A Revised Target must be displayed on the scoreboard as soon as it comes in to play.

         18.3.2.1.1.We recommend that all clubs, whether they have electronic scoreboards, flip numbers or tins look for solutions around their own scoreboard functionality to display “Revised Target” alongside the first innings score and be ready to amend this should overs be lost.

       18.3.2.2.Where the “Par Score” is likely to be relevant (in that weather is threatening and so the game may come to an abrupt end) or the umpires or batsman request it,

         18.3.2.2.1.all clubs must be able to share the D/L/S Par at the end of each over (or the ultimate solution to display it after each ball).