Vietnamese Volleyball Is Missing a System That Counts

The fourth set stands at 22-23. The rally runs through seven contacts, the ball hits the blocker's hands and sails beyond the sideline. The first referee blows the whistle, signals out, and awards the point to the defending side. The attacking team's coach is out of his chair, tapping his own wrist, shouting that the ball touched the block. More than four thousand spectators join in. The line judge, standing about seven metres from the point of contact, holds his signal. There is no replay screen in the arena, and nobody gets a second look at that frame. Forty seconds of argument pass, the score stands, the set continues.

The same rally, in a competition equipped with a video challenge system, takes about sixty seconds: the captain raises a hand, the referee signals, the technical crew rebuilds three angles, and the final call belongs to a slow-motion frame. Nobody has to shout. Nobody has to place their trust in the eyes of a person standing seven metres from the contact.

The distance between those two situations is not in the rulebook. Vietnamese volleyball applies the FIVB rulebook, updated on cycle, and most domestic refereeing decisions I have gone back through were correct. The problem sits in the recording layer: nothing stores the rally, so every dispute ends in belief, and belief always leans toward whatever suits the home side.

The Rulebook Is Not the Place to Argue

The rules settle the situation above with clear provisions. A block does not count as one of a team's three contacts, so a block touch reshapes how the rest of the rally is counted. A blocker may reach beyond the net, provided he or she does not interfere with the opponent before or during the opponent's attack. A ball that touches the block and then flies out is the attacking team's fault, and the point goes to the blocking side. In the rally that opens this article, neither team disagreed about the rules. They disagreed about a physical event lasting a few thousandths of a second.

At the speed of a top-level spiker, the ball can leave the hand faster than 90 km/h, roughly 25 metres per second. From the attack line to the block is barely more than two metres, so the flight lasts less than a tenth of a second. The moment of contact between ball and block is shorter still. In many rallies the deflection after contact is only a few centimetres — enough to push the ball outside the sideline, and enough that the naked eye cannot separate it from a ball that touched nothing at all.

The human brain needs about a tenth of a second to register an event and turn it into a decision. The line judge has to do that while tracking a small object moving sideways, sometimes screened by bodies and blocking hands. The limit lies in eyesight, not in competence or professional integrity. This is why veteran officials tend to tell each other one simple thing: they will only be certain about what they actually saw, never about what they inferred.

Sixty Seconds Instead of Forty

FIVB introduced the video challenge system in its major competitions from the middle of the 2010s, and it reached the Olympic Games afterwards. The mechanics are tidy: each team has two challenge requests per set, keeps the request if it is upheld, and loses it if not. Only the captain may raise a hand, and the request must be made the moment the rally ends. The challenge catalogue covers ball in or out, block touch, net touch, ball touching the floor, service position fault, and back-row attack fault. The technical crew must rebuild the deciding frame, usually within half a minute.

What matters is that the system changes behaviour more than it changes outcomes. With a screen in the arena, coaches stop shouting at referees. They raise a hand, wait, and accept the ruling. The referee shifts from suspect to executor of a protocol agreed before the match. The right to complain turns into a procedure that is limited, priced, and recorded.

In a match without a screen, that role collapses onto one person. I have sat taking notes at matches with only a few hundred spectators and noticed a detail: the emptier the stands, the easier it is to suspect the referee. When the stands are empty, I see the referee tremble. Not from pressure, but from a shortage of actors for them to perform against. No screen, no slow motion, no one else to blame except the person holding the whistle.

What the Match Report Leaves Blank

A professional volleyball match generates hundreds of data points: every serve, every reception, every set, every spike, every block, every dig. At FIVB level all of it is coded into the federation's volleyball information system, with each contact classified against a shared standard. That is where the indicators international fans take for granted come from: attack efficiency, perfect-pass rate, blocks per set, and the ratio of aces to service errors.

In our national championship, most of those indicators do not exist publicly. The official match report records line-ups, substitutions, set scores, sanctions, timeouts, and a handful of aggregate figures. The data that decide a player's value — the perfect-pass rate of a libero such as Nguyen Thi Kim Lien, the kill efficiency of an outside hitter who has played abroad such as Tran Thi Thanh Thuy, the successful blocks of a middle blocker — mostly stays inside the heads of spectators.

Based on my own experience following matches, answering a very simple question such as which middle blocker blocked better this season once required me to note every block of several dozen matches by hand. Three working days for a question a standard system answers after every set. I was thrown out for reading the rulebook correctly. Fortunately, some things can only be seen clearly from outside the door.

Missing data carries a consequence that has nothing to do with technique. Without data, every argument about personnel becomes an argument about memory, and the winner is whoever remembers hardest, not whoever is right. Choosing a libero, choosing an outside hitter, choosing a starter for the national team drifts toward feeling. And when feeling leads, public pressure becomes part of the professional decision, which no volleyball nation wants.

The Bottleneck Is Not the Camera

The usual response after every dispute is a call to buy technology. The wish is understandable, but it puts the steps in the wrong order. A full video challenge setup needs multiple cameras, servers, reconstruction software, and an operating crew; per-match rental is estimated in the tens of millions of dong, far beyond what one national-league fixture can bear. Meanwhile, two statisticians trained to the international standard and one unified electronic match report cost several times less, and deliver value across a whole season rather than for a single rally.

The two products answer two different questions. A video challenge answers exactly one question: was this rally right or wrong. A data system answers the bigger question: where is this team strong and where is it weak. A league that buys cameras gains a few more accurate rulings each set. A league that builds data gains a profile of every player, every team, and every opponent across years.

From the viewpoint of someone working in competition discipline, I have found that pressure on referees in domestic competitions comes largely from one place: they are the only party required to produce a verdict, while nobody holds evidence with which to check that verdict. When a camera turns on a sentence, I do not argue. I let the camera testify. That approach does not require an expensive system: it requires a habit of record-keeping and a place to publish what was recorded.

The First Thing to Do

Vietnamese volleyball can start with two inexpensive steps. Step one is to standardise the electronic match report around FIVB contact codes: two recorders per match, data published after each round, and the core indicators returned to the clubs themselves. Step two is to pilot video challenge in one round of the national championship, or at an international event hosted at home, limited to the two or three most important categories. Doing it slowly and tightly beats doing it broadly and loosely.

The international trend runs against our hesitation. Regional competitions are gradually adopting video challenge, major events publish data after every match, and any national team aiming higher must prepare for opponents with profiles rather than with memory. Vietnam's women's national team, with pillars such as Tran Thi Thanh Thuy and Nguyen Thi Bich Tuyen, is at the stage that needs data most: a generational handover requires knowing who is ready, who is not, and which skills are missing.

Before buying a camera, start with an electronic match report. Rules do not feed people, but people feed the rules with model rallies. And to know which rally is a model rally, someone first has to write it down.