how does duckworth lewis method works............?

Question

explain me how to calculate

Answer 1

Summary of the Duckworth Lewis method


• The D/L method sets a revised target for the side batting second (Team 2) when overs have been lost by a suspension in play. The revision is not in proportion to the numbers of overs the two sides can receive but is in accordance with the run-scoring resources the two sides have at their disposal. These resources include both overs and wickets in combination.

• A table gives the resources remaining at any stage of an innings for any number of overs left and wickets lost. The resources are expressed in terms of the percentages of the resources of a full 50-over innings. This table may be different for different Team 1 innings and can be produced by the computer software available.

• If either innings is shortened after it has started then the balance of resources of the two sides is upset and a revised target needs to be set in accordance with the resources available to the two sides. To find the resources available for either innings, you use the table to find out the resources lost from that innings and subtract this from the resources with which the innings started. If the innings started with 50 overs to be received, the resources at the start of the innings are 100%. But if the innings is shortened before it starts, or if the match is of less than 50 overs per side, then the resources at the start are less than 100%.

• To find the resources lost from an innings due to an interruption:
(i) note the numbers of overs left and wickets lost at the start of the suspension; use the table to find the resources remaining
(ii) note the same at the resumption of play and from the table read off the resources now remaining
(iii) subtract (ii) from (i) to give the resources lost.

• To find the resources available subtract the resources lost from the resources that were available when the innings started.

• When a revised target has to be set, find the resources available for both sides and calculate the revised target as follows, always rounding down to a whole number.

• If Team 1's resources are denoted by R1 and Team 2's resources by R2, then
Team 2's revised target = Team 1's actual score x R2/R1, plus one run, rounded down as necessary. (One run less than the target gives a tie.)

Please note this is a revised and updated summary of the D/L method based on the Professional edition, August 2004

Answer 2

The D/L Method has of course been adopted by cricket authorities around the world as the way of determining revised match totals after rain.

The D/L method sets a revised target for the side batting second (Team 2) when overs have been lost by a suspension in play. The revision is not in proportion to the numbers of overs the two sides can receive but is in accordance with the run-scoring resources the two sides have at their disposal. These resources include both overs and wickets in combination.

A single table gives the resources remaining at any stage of an innings for any number of overs left and wickets lost. The resources are expressed in terms of the percentages of the resources of a full 50-over innings.

If either innings is shortened after it has started then the balance of resources of the two sides is upset and a revised target needs to be set in accordance with the resources available to the two sides. To find the resources available for either innings, you use the table to find out the resources lost from that innings and subtract this from the resources with which the innings started. If the innings started with 50 overs to be received, the resources at the start of the innings are 100%. But if the innings is shortened before it starts, or if the match is of less than 50 overs per side, then the resources at the start are less than 100%.

n To find the resources lost from an innings due to an interruption:

(i) note the numbers of overs left and wickets lost at the start of the suspension; use the table to find the resources remaining

(ii) note the same at the resumption of play and from the table read off the resources now remaining

(iii) subtract (ii) from (i) to give the resources lost.

n To find the resources available subtract the resources lost from the resources that were available when the innings started.

n When a revised target has to be set, find the resources available for both sides and calculate the revised target as follows, always rounding down to a whole number.

n If the resources available to Team 2 (denote this by R2) are less than those for Team 1 (R1), then the target is revised downwards in proportion to the resources.

Thus Team 2's revised target = Team 1's actual score x R2/R1, plus one run. (One run less than the target gives a tie.)

If the resources available to Team 2 are greater than those for Team 1, then Team 2's target must be revised upwards. The excess runs required are calculated by applying the excess resource to the average 50-over total of 235 (or whatever number is decided upon for the appropriate class of game).

Thus Team 2's revised target = Team 1's actual score + (R2 - R1) x 235/100, plus one run. (One run less than the target gives a tie.)

For more details about D/l Method, please check the following links:

http://www.surreydowns.org/DL-Method.htm

http://en.wikipedia.org/wiki/Duckworth-Lewis_method

Answer 3

The D/L method works using the notion that teams have two resources with which to make as many runs as they can - these are the number of overs they have still to receive and the number of wickets they have in hand. From any stage in their innings, their further run-scoring capability depends on both these two resources in combination. The single table gives the percentage of these combined resources that remain for any number of overs left and wickets lost. An extract of the over-by-over table is given in Table 1. (A ball-by-ball version of the table has also been produced to enable scorers to deal with instances when play is interrupted mid-over.)

When a match is shortened after it has begun, the resources of one or both teams are depleted and the two teams usually have different amounts of resource for their innings. In this case a revised target must be set. The D/L method does this in accordance with the relative run-scoring resources available to the two teams. If stoppages cause the team batting second (referred to here as Team 2) to have less resources available, as is more often than not the case, then their target will be revised downwards. If, on the other hand, as often happens when Team 1's innings has been interrupted, the stoppages result in Team 2 having more resources available, then their target is revised upwards to compensate for the extra resources they have at their disposal.

Table 1: Extract from the table of resource percentages remaining

Wickets lost
Overs left 0 2 5 7 9
60 107.1 87.9 50.0 26.5 7.6
50 00.0 83.8 49.5 26.5 7.6
40 90.3 77.6 48.3 26.4 7.6
30 77.1 68.2 45.7 26.2 7.6
25 68.7 61.8 43.4 25.9 7.6
20 58.9 54.0 40.0 25.2 7.6
10 34.1 32.5 27.5 20.6 7.5
5 18.4 17.9 16.4 14.0 7.0

Reading the table

The single table applies to all lengths of one-day matches from 60 overs-per-side downwards. [In 1997 there was a separate table for all lengths of matches from 60 to 10 overs per side.] Because 50 overs-per-side matches are by far the most common, the resources listed in the table are expressed as percentages of those available at the start of a 50 over innings. Thus when there are 50 overs still to be received and no wickets have been lost, the resource percentage available is 100%. 60 over innings start with a resource percentage of 107.1% compared to a 50 over innings and 40 over innings start with a resource percentage of 90.3% compared to a 50 over innings.

In order to determine the correct resource percentage the batting side has remaining at any stage of an innings, the number of overs left must be identified. This number of overs left, in conjunction with the number of wickets lost, is then used to read the resource percentage remaining from the table.

For example, suppose that after 20 out of 50 overs a team have lost 2 wickets. They have 30 overs left. From the table you will see that the resource percentage remaining is 68.2%.

Suppose now that there is an interruption in play and 10 overs are lost from the innings of the batting side. When play can resume there are only 20 overs left but there are still, of course, 2 wickets down, and the table now tells us that the resource percentage remaining is 54.0%. Thus the shortening of the innings has caused the team to lose a resource percentage of 68.2 - 54.0 = 14.2%.

Having started with a resource percentage of 100% and lost 14.2%, then if they complete their innings with no further loss of overs, they will have had a resource percentage available for their innings of 100 - 14.2 = 85.8%.

Applying the D/L method

The procedure for setting a revised target, which is the same for any number of stoppages at any stage of the match, is as follows.

For each team's innings
(a) from the table note the resource percentage the team had available at the start of their innings;
(b) using the table, calculate the resource percentage lost by each interruption;
(c) hence calculate the resource percentage available.
If Team 2 have less resources available than Team 1, then calculate the ratio of the resources available to the two teams. Team 2's revised target is obtained by scaling down Team 1's score by this ratio.
If Team 2 have more resources available than Team 1, then calculate the amount by which Team 2's resource percentage exceeds Team 1's. Work out this excess as a percentage of 225 [the average 50 over score in ECB matches and one-day internationals (ODIs)] and this gives the extra runs to add on to Team 1's score to give Team 2's target.

Answer 4

http://www.icc-cricket.com

The D/L method works using the notion that teams have two resources with which to make as many runs as they can - these are the number of overs they have still to receive and the number of wickets they have in hand. From any stage in their innings, their further run-scoring capability depends on both these two resources in combination. The single table gives the percentage of these combined resources that remain for any number of overs left and wickets lost. An extract of the over-by-over table is given in Table 1. (A ball-by-ball version of the table has also been produced to enable scorers to deal with instances when play is interrupted mid-over.)

When a match is shortened after it has begun, the resources of one or both teams are depleted and the two teams usually have different amounts of resource for their innings. In this case a revised target must be set. The D/L method does this in accordance with the relative run-scoring resources available to the two teams. If stoppages cause the team batting second (referred to here as Team 2) to have less resources available, as is more often than not the case, then their target will be revised downwards. If, on the other hand, as often happens when Team 1's innings has been interrupted, the stoppages result in Team 2 having more resources available, then their target is revised upwards to compensate for the extra resources they have at their disposal.

Table 1: Extract from the table of resource percentages remaining

Wickets lost
Overs left 0 2 5 7 9
60 107.1 87.9 50.0 26.5 7.6
50 00.0 83.8 49.5 26.5 7.6
40 90.3 77.6 48.3 26.4 7.6
30 77.1 68.2 45.7 26.2 7.6
25 68.7 61.8 43.4 25.9 7.6
20 58.9 54.0 40.0 25.2 7.6
10 34.1 32.5 27.5 20.6 7.5
5 18.4 17.9 16.4 14.0 7.0

Reading the table

The single table applies to all lengths of one-day matches from 60 overs-per-side downwards. [In 1997 there was a separate table for all lengths of matches from 60 to 10 overs per side.] Because 50 overs-per-side matches are by far the most common, the resources listed in the table are expressed as percentages of those available at the start of a 50 over innings. Thus when there are 50 overs still to be received and no wickets have been lost, the resource percentage available is 100%. 60 over innings start with a resource percentage of 107.1% compared to a 50 over innings and 40 over innings start with a resource percentage of 90.3% compared to a 50 over innings.

In order to determine the correct resource percentage the batting side has remaining at any stage of an innings, the number of overs left must be identified. This number of overs left, in conjunction with the number of wickets lost, is then used to read the resource percentage remaining from the table.

For example, suppose that after 20 out of 50 overs a team have lost 2 wickets. They have 30 overs left. From the table you will see that the resource percentage remaining is 68.2%.

Suppose now that there is an interruption in play and 10 overs are lost from the innings of the batting side. When play can resume there are only 20 overs left but there are still, of course, 2 wickets down, and the table now tells us that the resource percentage remaining is 54.0%. Thus the shortening of the innings has caused the team to lose a resource percentage of 68.2 - 54.0 = 14.2%.

Having started with a resource percentage of 100% and lost 14.2%, then if they complete their innings with no further loss of overs, they will have had a resource percentage available for their innings of 100 - 14.2 = 85.8%.

Applying the D/L method

The procedure for setting a revised target, which is the same for any number of stoppages at any stage of the match, is as follows.

For each team's innings
(a) from the table note the resource percentage the team had available at the start of their innings;
(b) using the table, calculate the resource percentage lost by each interruption;
(c) hence calculate the resource percentage available.
If Team 2 have less resources available than Team 1, then calculate the ratio of the resources available to the two teams. Team 2's revised target is obtained by scaling down Team 1's score by this ratio.
If Team 2 have more resources available than Team 1, then calculate the amount by which Team 2's resource percentage exceeds Team 1's. Work out this excess as a percentage of 225 [the average 50 over score in ECB matches and one-day internationals (ODIs)] and this gives the extra runs to add on to Team 1's score to give Team 2's target.

Answer 5

dude i dunno much abt it but it works after the second team who is chasing has played atleast 25 overs is applied...

wenever i have seen it , its mostly unfair as cricket is unpredictible .

Answer 6

please ask the this question to ICC.
or
if you know any player who played for international cricket & u can meet him & ask him

because
i don't know about it

Answer 7

http://en.wikipedia.org/wiki/Duckworth_Lewis

try this i think u can easily understand by this site

Answer 8

i dunno, but i reckon it's unfair and has robbed teams of victory, when both sides don't bat under the same conditions.

Answer 9

i dont know