ICC Media Information: Duckworth/Lewis calculations explained

- 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%.

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

- 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 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.)