Rain Rules in Cricket: DLS, Reserve Days, and Bad Light
Rain interruptions are the most disruptive external factor in cricket — they can shorten matches, require target recalculation (via DLS method), or render results impossible. This guide covers how rain rules work across Test, ODI, and T20 formats, including reserve day provisions for knockout matches and the bad light controversy.
Rain can interrupt cricket at any stage — before a ball is bowled (reducing the number of overs available) or during play (requiring a revised target via DLS). The consequences differ by format: in Tests, rain reduces available time but results are still achievable if a minimum number of overs are bowled over 5 days (20 overs per innings minimum for a result); in ODIs, a revised target is calculated using DLS if the match is shortened; in T20Is, the minimum requirement for a result is 5 overs per side — if a T20 cannot reach 5 overs per side, it is abandoned (no result).
The DLS Method in Practice
DLS (Duckworth-Lewis-Stern) calculates a revised target for the batting-second team when the match is shortened after the first innings is completed or interrupted. The DLS spreadsheet uses 'resources available' — a combination of overs remaining and wickets in hand — to determine what the second team's target should be given the reduced match length. Example: Team A scores 300 in 50 overs. Rain reduces Team B's innings to 25 overs. DLS calculates Team B's target as approximately 230 (not 150, which would be a simple pro-rata half of 300 — DLS accounts for the fact that batsmen score faster in shorter innings because wickets become proportionally more valuable).
Reserve Days
ICC knockout matches (World Cup semi-finals and finals) have reserved days — an extra day scheduled in case rain prevents completion on the primary match day. If the match cannot be completed on the reserve day (very rare), it is decided by: seeding or group stage position (the higher-seeded team advances); or in older World Cup formats, a coin toss. The 2021 T20 World Cup (UAE) had reserve days for semi-finals and the final. The 2024 T20 World Cup (USA/West Indies) had a notable reserve day scenario when rain affected the semi-final between India and England at Guyana — play was eventually completed on the primary day after a late weather window.
Bad Light
Bad light occurs when the ambient light at a cricket ground falls below a standard that the umpires deem safe for play — specifically, that facing fast bowling (140+ km/h) in poor light creates unacceptable danger to batsmen (the ball may not be visible soon enough for safe evasion of rising deliveries). The umpires offer the batting team the option to come off for bad light — the batting team can choose to continue playing (accepting the risk) or request to come off. Controversially, batsmen sometimes remain on the field in poor light against spin bowling (where the risk is lower) and come off when pace bowlers are introduced. The bad light rule is one of cricket's most debated — England have been accused of taking bad light when ahead in series position, creating rain-like stoppages when the match conditions favour the opposition.
Frequently asked questions
How does DLS work in cricket?
The Duckworth-Lewis-Stern (DLS) method calculates a revised target for the batting-second team in a shortened match. It uses a 'resources available' framework: each team has a certain proportion of match resources (calculated from wickets in hand and overs remaining). If rain reduces the second innings, the DLS system calculates what proportion of resources the second team has relative to the first team's entire innings — and adjusts the target proportionally. A team facing a shorter match has fewer resources available — their target is reduced to reflect this. The DLS method replaced the previous average run rate method, which could produce unjust targets (as in the infamous 1992 South Africa vs England World Cup calculation).
What happens if a cricket match is abandoned due to rain?
If a cricket match is abandoned due to rain, the result depends on: how many overs were completed and which format is being played. In Tests: if the minimum overs are not completed (20 overs per team), the match is drawn. In ODIs: if fewer than 20 overs are completed by the team batting first, the match is abandoned (no result). If the first innings is complete but the second is interrupted, DLS applies to set a revised target — if the minimum (usually 20 overs for the chasing team) is not reached, no result. In T20Is: if either team bats fewer than 5 overs, the match is abandoned. For ICC knockout matches (semi-finals, finals), a reserve day is scheduled to allow completion.
Can teams choose to play in bad light?
Yes — the umpires offer the batting team the option to come off for bad light (they do not force play to stop). The batting team can choose to continue playing in poor light — which they sometimes do when: the match is in a critical phase where stopping would benefit the fielding team; the remaining overs are few and stopping for light would prevent a result; or spin bowling is being used (where the risk of poor light is lower than against pace bowling). The batting team's option to accept or reject bad light has been criticised as allowing teams to tactically manipulate the match duration — proposing that the umpires should have the sole authority to stop play regardless of batting team preference.