One Name, Three Rulebooks: The Discipline-Identification Problem in Professional Billiards

Late at night in Liverpool, I ran a small script to parse a 2,400-word billiards analysis I had just finished. It returned exactly one line: domain: billiards. Title field empty. Source field empty. Information points empty. Entity list empty. Source-quality assessment: not performed.

I checked the code. No syntax error. The script ran exactly as designed. It swept through a piece full of names, tournaments, dates, table dimensions and ball diameters, and extracted a single word.

It took me two more nights to write down what anyone working with data should have seen sooner: the fault is elsewhere. The article I fed in was not short of information. It lacked a frame of reference to file that information in the right drawers.

I do not watch football for entertainment. I watch it to decode it. With billiards, I had told myself for seventeen years that I followed the same process. That screen was the counter-evidence.

"Billiards" is an umbrella word, and I used it carelessly for years. It contains at least six competition systems that cannot even agree on a shared definition of a good shot.

Snooker is played on a 12 ft table, a playing area of 11 ft 8.5 in, 22 balls, a ball diameter of 52.5 mm, napped cloth and rounded pocket jaws. Scoring comes from breaks — a player must alternate reds and colours, and the value of one shot depends on whether the next shot happens at all.

American pool is played on tables of 7 to 9 ft, with 57.15 mm balls, worsted cloth and straight-cut pockets. In 9-ball, the player must strike the lowest-numbered ball on the table first, and a whole match can end in three shots if the break opens correctly.

Chinese 8-ball is the strangest variant in the group: a 9 ft pool table, pool balls, but pocket jaws cut to snooker specification. Rounded, tight, and punishing of every error in pace. That is the single largest technical difference Western media almost never mentions when it calls everything "pool".

Three-cushion carom has no pockets. Three balls, a 10 ft table, and the object is to contact three cushions before contacting the target ball. Russian pyramid uses 12 balls of noticeably larger diameter and pockets so tight that a shot considered correct in pool is a miss there.

Six systems. Six rulebooks. Six coaching traditions. Six markets.

Above them sits a governance structure that is fragmented in the same way. Professional snooker sits under the WPBSA and the World Snooker Tour; amateur snooker under the IBSF; pool under the WPA; carom under the UMB. All of them sit beneath an umbrella body, the WCBS, recognised by the International Olympic Committee. At the umbrella level everything looks tidy. At the data level everything is scattered.

I once tried to build a tracking table for the regular season, pooling every billiards event I could watch into one database. It collapsed at the third column.

The first column was the player's name. No problem.

The second was the tournament name. The problem began to show: several events carry the word "world" in the title but are open to only one discipline, and that word carries no universal meaning.

The third column was the performance metric. That is where it collapsed. Not one metric in billiards can be transferred between disciplines without losing its meaning.

Take the clearest example: the 147 maximum in snooker. It is a unit of measurement belonging to snooker and it does not exist elsewhere. In 9-ball, the emotionally equivalent unit is the golden break, but the mechanism is entirely different: one is a sequence of fifteen consecutive shots with controlled cue-ball position, the other is the outcome of a break shot and a measure of luck. Placing them side by side on one chart is a methodological error.

Ronnie O'Sullivan has seven world snooker titles and fifteen competitive 147s in his professional career. That figure only means something inside snooker. Set it beside a Chinese 8-ball player with three national titles and O'Sullivan's number says nothing about who plays billiards better. It only says the two men play under two different rulebooks.

The same problem applies to the phrase "world champion". In snooker it is bound to the Crucible and a seventeen-day format, two final sessions, a maximum of 35 frames. Endurance is a genuine tactical variable. In 9-ball, the world title is decided in a far shorter format, where one bad break can wipe out a match. The two formats produce two psychologically different kinds of player, and no ranking can compare them.

This fragmentation has a cost, and the largest cost is not academic. It is compliance.

In June 2026 the WPBSA announced sanctions against ten Chinese players after a months-long match-fixing investigation. Two of them — Liang Wenbo and Li Hang — received lifetime bans. Yan Bingtao received five years. Zhao Xintong received one year and eight months. The remaining eight received bans ranging from one year to nearly eight.

More than a decade earlier, the John Higgins case of 2026 shook snooker in a different way: he was cleared of match-fixing but banned for six months and fined GBP 75,000 for failing to report an approach. Two cases, two eras, one shared feature: nothing becomes clear until somebody sits down and reclassifies matches by hand.

I followed the 2026 case from a narrower angle: where the matches under investigation were played, under which rulebook, and who held the data on them. The final answer was not clear. The same player competes across multiple tour systems; the same match appears in multiple aggregators under the single label "billiards". When an investigator wants to reconstruct a behavioural pattern, that person has to reclassify every match from scratch, because aggregated data does not preserve the discipline field.

A data system that compresses six rulebooks into one label creates a compliance blind spot exactly the size of the ambiguity.

Put differently: if you want to model a player's behaviour, the first thing you need to know is which rulebook that player is competing under. Without that field, every model is measuring a mixture.

Money is not distributed evenly across the six systems either, so the power map differs by system. Snooker has the Crucible, long-term British broadcast contracts and a vast Chinese market; the 2026 world champion collected GBP 500,000. Professional 9-ball operates as an international tournament circuit with sponsorship money from the Gulf and Asia. Chinese 8-ball lives almost entirely off its domestic market, with a dense tournament structure that barely appears on Western television. Three revenue streams, three competitive calendars, three development pathways. A single unified ranking would capture none of them.

There are three different explanations for this fragility, and I should set them out because I am not certain which is right.

The first is technical: billiards data infrastructure is weak because there is not enough money to pay for infrastructure. Compared with football, where every pass is logged by three independent providers, billiards runs on data entered by the organisers themselves. No competitive pressure, no quality standard.

The second is structural: fragmented governance means nobody has an incentive to build a common standard. The WPBSA has no reason to fund the standardisation of pool data, and vice versa. Each body optimises for its own ecosystem.

The third is commercial, and it is the one I lean toward: ambiguity benefits the people selling the story. A headline containing "billiards world champion" travels further than one specifying "9-ball world champion". The vagueness is not a defect to be repaired; it is an asset to be protected.

These three explanations are not mutually exclusive. But they lead to three entirely different courses of action, which is why I have not chosen one.

One thing I have learned from years of working with spreadsheets: when data refuses to settle, it usually means the wrong unit is being measured. In football the units are metres and seconds. In billiards the unit has to be the rulebook.

I once wrote about Luka Modric's 13.7 metres at the 2026 World Cup — the average separation he created from the screening defender each time he received the ball. The lesson of naming a space is this: you can only measure something once you have established which system it belongs to. Modric plays football. There is one rulebook. There is one pitch. There is one goal. He never has to state before kick-off which sport he is playing today.

Zhao Xintong won the 2026 World Snooker Championship as an amateur, after his suspension expired, beating Mark Williams in the final. A huge story, and a story belonging entirely to snooker. If someone files it into a combined table alongside the week's pool results, that table both loses information and manufactures the illusion of a universal ranking.

The natural reaction to fragmentation is consolidation. Many people in the sport have proposed exactly that: a single billiards ranking, a single "billiards world champion" title, a cross-discipline player profile.

I think that is a systemic mistake, and the mistake lies in solving the problem at the analysis layer while the problem sits at the collection layer.

A unified ranking would look highly convincing. It would have number columns, positions, rising and falling charts. But it would add the points from a 140 break in snooker to a golden break in 9-ball, and that sum is meaningless. We would have a beautiful and wrong metric.

The correct approach sits three steps earlier: the data-entry clerk. When a match result is written into a system, the first field must be the discipline, not an umbrella label. Until the discipline is identified, every downstream field — performance, head-to-head, honours — is contaminated data.

The offset diamond only appears when you stop looking at the ball. I learned that sentence from billiard tables, not from grass. Staring at the final shot is the surest way to miss what decided it. In this story, the final shot is the ranking table. What decides it sits in the first empty box of the entry form.

The execution blind spot here is very concrete: nobody is punished for entering the wrong thing. A data vendor that lumps all billiards under one label will not lose its contract, because its clients are lumping in exactly the same way. An error replicated twice starts to look like a fact. And when a systemic error causes no immediate consequence for anyone, it outlives the people who spotted it.

Every genius leaves behind a gap few people can measure. In billiards, the biggest gap right now is not on the table. It is in the first field of every form.

Next time you read a billiards result, try a small check: which rulebook, how many feet was the table, and who is the body that recognises the title. Those three questions, placed side by side, will reveal almost the entire reliability of the information behind it. And if you are building a database, do what I failed to do that night in Liverpool: make the discipline field mandatory before any other field can be saved.

I still have not re-run that script. I want to leave it as it is for a while longer.