On 28 March 2023, three days before the IPL 2023 season began, Gulf News published an explainer on a substitution rule the league had never run. The opener was already on the schedule: defending champion Gujarat Titans against Chennai Super Kings at the Narendra Modi Stadium in Ahmedabad on 31 March 2023, with 73 more league matches to follow and the final set for 28 May 2023. The piece did not pick a side. It walked through what the new rule asked of the captains at the toss, what it let them do mid-match, and what it did not let them do at all. Read back today as a dated record, the explainer is the cleanest description of how the rule was set out before any captain had used it.
The rule the explainer covered was the Impact Player. Its mechanic is a full substitution. One player on the field is replaced by another, at any stage of the match, with the replaced player taking no further part and the replacement assuming the full batting and bowling duties of the player he came in for. The replacement is triggered by the captain, on the captain's call, and the trigger is single-use. A side that activates the lever once in a match has used it. A side that does not activate it leaves the named-four substitutes on the bench for the entire evening.
Reading the explainer as a record of what was announced and how it was framed, the most useful thing it does is separate the parts of the rule that were new from the parts that were inherited from earlier substitution history. The new parts were the captain-triggered activation, the broader trigger window, and the lack of a like-for-like restriction on the replacement. The inherited part was the bench itself: a list of substitutes named before the match, with one of them designated for a single-event substitution. That mechanic ran on the same kind of bench shape cricket had used for the concussion substitute since 2014.
The substitution mechanic, line by line
The Gulf News explainer laid the rule out as a sequence of operational steps rather than as a list of permissions. The first step ran at the toss. The captain named a starting XI. Alongside the XI, the captain named four additional substitutes. The four-substitute list was locked at the toss. It could not be changed during the match. The starting XI could not be changed during the match by any path other than the Impact Player substitution itself. The four named substitutes were the only source of mid-match change.
The second step ran at the captain's call during the match. The captain chose one of the four named substitutes. The chosen substitute came onto the field as a full replacement for one of the eleven starters. The replaced starter took no further part in any phase of the match, including the second innings if the match went that far. The replacement assumed full batting and bowling duties. There was no partial substitution. There was no rotation slot. The substitution was closed once it was made.
The third step was the absence of a step. The explainer did not describe a path back. A captain who activated the lever for a wrist-spinner in the powerplay could not reverse the activation at the death. A captain who used the substitution for a left-handed batter in the eighth over could not use it again for a different left-handed batter in the sixteenth. The mechanic was a single event. Reading the explainer as a dated record, the operational lesson is that the lever was committed the moment it was pulled.
Four named substitutes and the locked-at-the-toss list
The most concrete change the rule made to the toss was the addition of a bench. Before the rule, the toss settled the playing XI. Under the rule, the toss settled the playing XI plus a four-name substitutes list. The list was published, locked, and visible to both sides. A selector reading a pre-match brief the day before the toss could no longer assume the XI was the full team sheet. The XI was still the main sheet. The named-four substitutes list was the second sheet, and the second sheet decided which tactical lever the captain was willing to pull later.
The Gulf News explainer framed the four-name list as a public commitment. A captain who named three frontline bowlers and a batting all-rounder on the bench was signalling a bowling-first posture. A captain who named a wrist-spinner and a power-hitter was signalling a matchup posture. A captain who named four seamers was signalling a pace-first posture. The list was the readable signal; the activation was the captain's later choice from that signal.
The four names on the bench are the captain's public commitment
Pre-match reporting that publishes the XI without the four named substitutes leaves the tactical layer off the printed sheet. The bench decides which lever the captain is willing to pull later in the evening.
The four-name list also moved the planning window. Under the previous rules, a captain's tactical decisions ran inside the match. Under the new rule, a captain's most consequential tactical decision (the bench shape) ran in the hours before the toss. A captain who wanted flexibility at the death had to name a death-overs bowler on the bench and accept that one of the four slots was committed to that role. A captain who wanted a left-handed matchup option had to name a left-arm spinner on the bench and accept the same commitment. The bench shape was the captain's pre-toss promise of how the lever would be used if it was used.
The Indian-only clause in a four-overseas XI
The cleanest constraint in the explainer was also the most consequential for fantasy selectors. If the starting XI already had four overseas players, the Impact Player had to be Indian. A side could use an overseas substitute only if the starting XI had fewer than four overseas players. The clause was not a footnote. It decided whether the substitution lever could be an overseas matchup weapon or whether it had to be drawn from the Indian player pool.
Reading that clause in IPL 2023 terms, the sides that ran four-overseas XIs (and several did, especially in the power-hitting phase of the league) had to plan with the Indian-only default. Bringing in an overseas wrist-spinner mid-match was not available to them. Bringing in an overseas death-overs batter was not available to them. The four named substitutes had to be Indian, and the Impact Player chosen from those four had to be Indian. The credit ceiling on that lever was the Indian pool, not the global pool.
Sides that ran three overseas players had a wider choice at the bench. They could name an overseas batter, an overseas seamer, or an overseas wrist-spinner among the four substitutes, provided the named-four list included that overseas player. The wider choice carried a credit cost, because naming an overseas player on the bench meant an overseas player did not start. The trade-off was between an overseas starter and an overseas lever, not between an overseas starter and an additional overseas option elsewhere. The explainer treated this trade-off as fixed.
The matchup example: off-spinner for a left-handed batter
The Gulf News explainer used one worked example to illustrate the lever: an off-spinner brought in specifically for a left-handed batter uncomfortable against spin. That example worked because the lever was binary. A captain could swap one of his four named substitutes into the match in place of a starter, at any stage, and the swap was closed once made. The example did not extend to a wholesale bowling rotation. It extended to one specialist bowler, brought in for one specific matchup, at one specific moment.
Reading the example as a dated record, the operational lesson is that the lever is a single bowler, not a rotation. A captain who burned the Impact Player on a wrist-spinner for the powerplay could not pull the lever again for a left-arm spinner at the death. A captain who used the lever on a left-handed batter in the eighth over could not use the lever on a different left-handed batter in the sixteenth. The lever was a single-event commitment, and the captain's job was to choose the moment the activation was worth committing to.
The lever is a single bowler, not a rotation
The off-spinner-for-left-hander example in the explainer was the rule's purpose as a one-shot matchup tool, not a wholesale mid-match bowling rotation. The activation is one event, capped at one of the four named substitutes.
The example also clarified what the rule did not change. The batting order remained the captain's call. The bowling order remained the captain's call. The field-setting remained the captain's call. The substitution lever did not give the captain any new path into those decisions; it gave the captain one new path out of an existing decision. The off-spinner-for-left-hander example sat inside the existing tactical framework. It did not replace the framework.
The 31 March 2023 Ahmedabad opener
The opening fixture at the Narendra Modi Stadium was the cleanest possible first test of the new rule. Gujarat Titans entered as the defending champion, with Hardik Pandya having lifted the IPL winners' trophy on 29 May 2022 after a rain-affected final at the same ground. Chennai Super Kings were the most experienced side on the IPL circuit, with multiple title wins across the previous decade. The match was a settled champion against an established challenger, with the new rule sitting on top of both.
The Gulf News explainer did not promise that the Impact Player would be activated in the opener. It promised that the rule was live from ball one of the opener. The distinction matters because the first weekend was a chance to see how captains actually used the named-four commitment, rather than how the league could use it in theory. The first weekend was also a chance to see whether the off-spinner-for-left-hander example was how the rule actually played out, or whether captains used it for a different purpose entirely.
Reading the explainer alongside the 2023 schedule, the opener's role was to put the rule into operational use. Both captains had to name four substitutes at the toss. Each captain had to commit to a bench shape before the coin landed. If a captain chose to activate the Impact Player later in the match, he had to commit to one of the four named substitutes. If the captain chose not to activate, the four substitutes stayed on the bench for the entire evening. The opener was a clean test of whether the four-name bench would be used as a tactical lever or held as an unused commitment. For per-franchise reads on how each side adjusted its bench shape after the rule was introduced, the team-level squad and tactical coverage tracks the bench commitments and the role shifts that followed across the 2023 season and beyond.
From the concussion substitute to a captain's call
The Gulf News explainer traced the lineage of the substitution framework rather than presenting the Impact Player rule as a clean break. The earlier, narrower version of the rule was the concussion substitute, introduced after the death of Australian batter Phil Hughes from a head injury sustained during a domestic match. The concussion substitute was a like-for-like replacement, triggered by a match-referee medical pathway. The Impact Player rule expanded the trigger and dropped the like-for-like restriction, while keeping the mechanic of a bench named at the toss.
For selectors reading the explainer back, that history explains why the four-name bench shape felt familiar. The shape was familiar. The trigger was not. A concussion substitute had to be activated through the match-referee pathway, on medical grounds, with a like-for-like restriction on the replacement. The Impact Player was activated by the captain, on the captain's call, at any stage of the match, with no like-for-like restriction. The operational difference was the trigger, not the bench shape. Both mechanisms ran on the same kind of pre-named substitute list. The Impact Player rule just handed the activation to the captain.
The lineage also clarified a quiet limit. The Impact Player rule did not sit alongside the concussion substitute as a parallel option in the same match. The two substitutions ran on different rails. The concussion substitute remained a medical swap, available across the IPL on a like-for-like basis. The Impact Player was a discretionary captain's choice, available across the IPL as a one-shot tactical lever. A side could activate a concussion substitute and an Impact Player in the same match, but the two mechanisms were not interchangeable. The four-name bench was the Impact Player's bench. The concussion substitute ran on a separate medical pathway.
What the rule still means for IPL squads today
Reading the 28 March 2023 Gulf News explainer as a dated record rather than a current bulletin, the lasting selection effect is the four-name bench and the captain-triggered activation. Squads are built with eleven starters plus a four-name substitutes list locked at the toss. Of those four substitutes, one can be activated on the captain's call, and the activation is a single event. The matchup lever, the Indian-only clause for four-overseas XIs, and the four-name bench are the three durable elements that followed the rule into later IPL seasons.
The procedural lesson for fantasy selectors is that the toss-time team sheet, not the pre-match XI, is the captain's public tactical contract. The XI is still the main sheet. The four named substitutes decide which lever the captain is willing to pull if the moment comes. Reading a pre-match brief without checking those four names is reading half the team sheet. The dated record of the 28 March 2023 explainer is the dated record of how the rule was set out before it was tested. The dated record of the 31 March 2023 opener is the dated record of how the rule entered IPL cricket. Reading the two together gives a selector the rule as written and the rule as used.
Beyond IPL 2023, the four-name bench shape spread into other franchise T20 leagues that adopted the Impact Player mechanic. The bench shape and the one-shot activation became the operational template. The Gujarat Titans vs Chennai Super Kings opener at the Narendra Modi Stadium on 31 March 2023 was the first match in which the template was used in front of a paying IPL crowd. The four-substitute commitment at the toss, named publicly before the coin landed, was the visible operational change. The activation later in the match, if it came, was the captain's read of the moment. Reading the 28 March 2023 explainer back is the cleanest way to see the rule as it was written before that first toss.
What did the Impact Player rule actually let a captain do?
It let a captain swap one of the eleven starters for one of four named substitutes at any stage of the match. The replaced player took no further part, and the replacement took the full batting and bowling duties of the player he came in for. The activation was a single event and could not be reversed.
When was the rule first used in an IPL match?
From the opening match of IPL 2023 on 31 March 2023, between Gujarat Titans and Chennai Super Kings at the Narendra Modi Stadium in Ahmedabad. The league ran 74 matches through the final on 28 May 2023.
Could an overseas player be the Impact Player?
Only if the starting XI had fewer than four overseas players. If the starting XI already had four overseas players, the four named substitutes and the Impact Player chosen from them had to be Indian.
What was the matchup example in the Gulf News explainer?
An off-spinner brought in mid-match for a left-handed batter uncomfortable against spin. The explainer used that as the cleanest worked example of the one-shot matchup lever the rule gave captains.
Where did the rule come from?
The explainer traced the lineage from cricket's prior substitution history, including the concussion substitute introduced after the death of Australian batter Phil Hughes. The Impact Player rule expanded that mechanic to a captain-triggered activation rather than a match-referee medical pathway.