Three Point Five Centimetres: Cricket's Review Protocol, Umpire's Call and the Economy of the Wasted Review

Hook

Forty-seven thousand people in the stands stopped breathing at the same moment. Third session of the day, the floodlights just beginning to throw long shadows across the pitch, the left-arm spinner's ball turned in, struck the batsman's pad, and the on-field umpire's arm stayed down. The wicketkeeper took two strides and stopped. The man at slip pressed a hand to his chest and drew a rectangle in the air with two fingers. The captain walked away from his crease, glanced at the big screen, then nodded. The screen filled with ball-tracking: a green trajectory, a yellow projection over the stumps, and then two words in white.

Ninety seconds of accounting, done. Batsman unbeaten. The team keeps its review. And the rarest currency in the match was spent on a question whose final answer no camera actually captured. What the camera captured was a mathematical projection — a model's guess at where a ball would have ended up.

I watch cricket two ways. Once from beside the boundary, and once from in front of a monitor, headphones on, stopwatch running. The seven-point checklist I wrote for the Premier League's VAR pilot at Stockley Park in 2026 was built for football. Sitting in a cricket box, I found the principle almost identical: the monitor does not lie; the angle does.

Context: The Stack and the Law

Technology entered cricket in stages, and at every stage the law lagged behind. In 2026 Allan Plaskett built the Snickometer — the simple idea of drawing stump-microphone sound as a waveform. In 2026 Hawk-Eye arrived in England on Channel 4's broadcast, then entertainment for viewers rather than a tool for umpires. Hot Spot came with infrared cameras showing the heat of bat-on-ball contact; cost and utility never balanced, and its international presence thinned out. UltraEdge arrived to process the same audio files through a different algorithm, so that the faintest spike of leather on willow becomes visible.

The formal journey began in 2026, with a trial on India's tour of Sri Lanka. The ICC approved it in June 2026, and on 24 November 2026 it was used in a live match for the first time, in the New Zealand-Pakistan Test at Dunedin. Eighteen years later we sit in a place where Tests allow two reviews per innings, ODIs and T20Is one; where the request must be made within fifteen seconds of the ball becoming dead; and where an umpire's call keeps the decision standing while the review itself returns to the team's pocket.

The technical layer stands on four separate pillars. Ball-tracking measures the path. UltraEdge measures the sound of contact. Hot Spot once measured the heat of contact. The front-foot camera measures the crease line — the TV umpire has checked this routinely since the 2026 World Cup, and in Tests since 2026.

The legal layer is older still. LBW rests on three questions: where did the ball pitch, where was the impact, and would it have hit the stumps. Each now splits into two parts: the event itself, and the margin of the technology's uncertainty. That second part is cricket's least discussed and most influential rule.

In 2026 the ICC retired another old habit — the 'soft signal' for catches and run-outs was scrapped. Now the on-field umpire decides first, and the TV umpire checks independently. A small change, but it rewired the chain of communication: no one can wrap private doubt inside a confident 'probably out'.

For a British audience there is a separate context. Most county grounds have no ball-tracking at all. The technology that kills or saves an LBW at an Ashes Test is simply absent at a ground in Kent in May. Two tiers of cricket run on the same laws but not on the same truth. That is the most uncomfortable backdrop to this whole argument.

Core: The Seven-Point Review Protocol

When I watch a review, I run through seven points in order. My notebook version, adapted for cricket:

1. Angle. Which camera, at what height, at what frame rate? The camera behind the bowler's arm and the camera behind the stumps tell two different stories about the same event.

2. Appeal type. LBW, caught behind, stumping, run-out, no-ball, catch — each has its own law and its own evidential threshold.

3. Point of contact. What did the ball hit first — pad, bat, glove, grip? Or two of them at once? Without this answer the rest of the analysis is incomplete.

4. Speed. What did real time show, what did slow motion show, what did ultra-motion show? Three different truths.

5. Line. Pitching, impact, stumps — three judgements, three separate margins.

6. Restart. Where does play resume, who is on strike, what happens to the runs.

7. Communication. What did the TV umpire say, how long did it take to say it, and what went on the screen.

Those seven points break the current argument into five separate debates.

Ball-tracking: a projection, not a photograph

This is the mistake viewers make every day — treating the last section of the ball-tracking graphic as a photograph. The bat-and-pad section, a camera genuinely saw. But the curved line the ball takes after it strikes the pad, travelling on towards the stumps — that is not on any camera. It is a model's estimate: release speed, air resistance, friction off the pitch, rate of spin, worn patches, the seam's position, all factored into a prediction.

My 2026 World Cup experience at a remote desk in Russia is useful here. Drawing offside lines in football taught me that technology's first job is not to decide — its first job is to admit its own limits. Cricket's ball-tracker calculates a confidence interval for every delivery. That interval is roughly half a ball's width. A cricket ball is about 7.2 centimetres in diameter, so half of it lands at roughly three point five to six centimetres. A question falling inside three point five centimetres is no longer a technological question; it is a question the law has chosen to forgive.

That is where umpire's call is born. If the projection shows the ball hitting the stumps but only clipping, not passing fully inside, the on-field decision stands. The decision remains unchanged even though extra information existed. Many viewers call that hypocrisy. It is actually a confession: the technology knows it does not know.

An umpire's call returns the review, and that is where the arithmetic turns. Two statements — 'the batsman was out' and 'the umpire was not wrong' — can be simultaneously true in cricket, just as they can be simultaneously false. In football this duality is hidden inside the phrase 'clear and obvious'. Cricket has no such phrase, and that empty space is the true birthplace of every review controversy.

UltraEdge: the fight between a spike and silence

UltraEdge displays an audio file; video is a sequence of still frames. The time units differ. Broadcast video runs at fifty frames per second in Europe or sixty in some regions, meaning twenty to forty milliseconds between frames. Audio is continuous, with no gaps. So a spike registers at the bat's edge while the ball is not yet visible in that exact frame — it appears two frames later. The viewer sees sound arrive before the ball. The TV umpire must reconcile two different clocks: the clock of sound and the clock of image.

My 2026 behind-closed-doors work taught me this most sharply. Across ninety-two empty-stadium matches I logged the interval between an umpire and a VAR operator and found it widened by 0.8 seconds without crowd noise. Sound sets our rhythm of expectation. Empty the stadium and the rhythm goes. Empty stadiums made the audio protocol louder than any crowd.

UltraEdge's second problem is wind and friction. Air disturbed as a fast bowler's ball passes the bat's edge can create a faint sound on the stump microphone. Bat knocking into pad creates another spike. Distinguishing which spike belongs to ball-on-bat requires frame-by-frame reconciliation. That is where point of contact — the third item in the protocol — becomes decisive: the sequence of what the ball hit first is what gives the sound its meaning.

The review economy: the captain as a semi-analyst

A review is a scarce resource, and scarce resources always invite strategy. Two in Tests, one in the shorter formats — that number sets the tempo of a captain's thinking. The fifteen-second rule requires the request after the ball is dead; hesitation means a lost opportunity.

Here I add a personal observation. In matches I have watched with a stopwatch, logging timings from the broadcast desk, the pattern is almost constant. Teams under no pressure take fewer reviews. Teams under pressure take more. A captain's personal instinct often outweighs the numbers. Some raise a hand the moment they see pad. Others decide only by looking at the keeper's or leg-slip's face. No ball-tracker measures those human signals.

One more thing belongs here. The decision to review is collective; the execution is individual. A wicketkeeper knows a bad review usually attaches to his name, even though the line and length calculation sits in the bowler's head. That gap in the division of responsibility causes many wasted reviews — the transfer market has offside lines too, you just cannot see them.

Communication: the nine-second rule and the big-screen problem

VAR protocol contains an idea called the 'nine seconds' — the silence before the verdict is announced. In football those nine seconds protect the audience's patience. In cricket the TV umpire is usually terse: 'Ball hit bat, out stands.' But the cricket review process is slower than football's, because every review involves at least three separate checks, each needing a different angle.

The big screen is a separate question. When a review replay goes up on the stadium screen, the crowd reaches a verdict while the TV umpire is still working. In January 2026, at the Sydney Cricket Ground, that is precisely what happened — a review replay appeared on the screen and the crowd's reaction changed the atmosphere of the ground. The laws contain no reference to that event.

So here is a constructive proposal. Before a review replay is shown inside a stadium, the broadcast director should work to a clear rule: no slow-motion replay before the verdict is announced. Football has that rule; cricket does not. Without it, the crowd builds a parallel judicial system, and players start feeling the pressure of that verdict before it is even given.

Contrarian: technology has not made cricket fairer

Now the part where I argue against my own profession. The sales pitch for DRS was simple: howlers will disappear. Eighteen years on, the count of errors is down but the arguments are not — the character of the argument has changed. We used to argue about decisions. Now we argue about margins. And margin arguments are far harder to settle, because they are claims about probability, not claims about events. Events can be proved. The limits of a probability cannot.

Second, and more uncomfortable. Power did not pass from the umpire to the technology. It passed to the broadcast director and the data provider. Which angle is shown, which frame comes first, which projection is put on screen — those are decisions made by a private company. The ICC umpire announces the verdict, but a commercial model manufactures its ingredients. The final word on a three point five centimetre question is not written in any statute; it is written in a proprietary algorithm.

Third, a cricket-specific point. The most controversial decision of the 2026 World Cup involved no ball-tracking, no UltraEdge, no Hot Spot. On 6 November 2026 in Delhi, Angelo Mathews became the first player timed out in international cricket. That decision was entirely a matter of law and zero per cent technology. It proves something: technology does not solve the biggest problems. It only sharpens efficiency at the margins.

Fourth, in the long view, technology has changed how umpiring is taught. Young umpires now learn to give fewer decisions, because players will hand them back. That instinct looks reasonable at first glance, and it carries a hidden cost: in the cricket that has no technology — county, domestic, the levels below first class — the same umpires work, and their decision-making habits are formed in a technological world. Two standards cannot easily coexist in one brain.

That is why point seven of my checklist, communication, matters most. I was the communication standard in football and I am here too. I have written it before and I write it again: ICC review verdicts need a new rule — the TV umpire should say why he is accepting a margin, not only what the margin is. Without the reason, everyone assumes the decision is bias, when in fact it was technological reticence.

Warning: monitor worship and its alternative

In my profession the greatest danger is one thing: forgetting the law while enjoying the measurement. Ball-tracking is an engineering statement. LBW is a legal statement. Read them as one and you will be wrong.

So the rule I use is this. First read the text of the law. Then add the frame rate and the confidence interval. Then explain the decision. Reverse the order and the analysis becomes mere model commentary, and the reader starts mistaking probability for truth.

Takeaway and the next question

I put forward one proposal, which I call the Review Ledger. After every international match the ICC should publish a short table: in which over, who reviewed, what was checked, where the technology was uncertain, and what the final decision was. A few hundred words per match. It would do three things — test teams' review skill, surface the patterns of technological error, and give viewers a written answer to the question 'why'.

My prediction is simple. The next reform will not come from more cameras or a higher frame rate. It will come from reducing the number of reviewable events — from drawing a clear list of which questions go to the technology and which stay in human hands. Because three point five centimetres will never be justice. Justice is the decision — and its foundation is the integrity of the communication.

In my notebook of twenty-seven years of angles there is one page where the same line keeps returning: Referee's Eye. For twenty-seven years that eye has been working — sometimes at the centre of the pitch, sometimes at the edge of a screen. The truth the monitor shows is accurate to three point five centimetres. The question is what we want to judge with it — the line of the ball, or the line of the game.