Six Rulebooks, One Name: The Discipline-Identification Gap in Vietnamese Billiards Data

Last Friday the rain over Hai Phong would not let up. I sat in the far corner of a billiards club on Lach Tray Street, an A5 notebook open, a ballpoint pen that needed two shakes before it gave ink. On the big screen a three-cushion carom match had reached its seventeenth inning. The scoreboard showed two lines only: points and average — points per inning. On a smaller screen, a Chinese 8-ball match was running: pockets, a different table, a different ball set, a different called-pocket rule.

The man beside me looked at both screens and said something very compact: “Billiards is billiards.”

I wrote the sentence down verbatim, under the line “field note, 21:14.” In one evening, in one room, I watched at least three things sharing one name: pocketless three-cushion carom, American pocket billiards, and Chinese 8-ball. Three rulebooks, three scoring systems, three tournament economies. One label.

For someone who earns a living reading tables of numbers, that is the worst signal among signals. An umbrella name does not make a number wrong. It makes the number meaningless the moment it is compared with another.

Four data lines that cannot speak to each other

In my tracking book, Vietnamese billiards occupies four separate lines. The first is three-cushion carom, the group where Vietnam holds genuine international standing, governed by the Union Mondiale de Billard (UMB). The second is American pool, 9-ball and 10-ball, run by the World Pool-Billiard Association and commercial promoters. The third is snooker, tightly bound to the British and Chinese ecosystems, with its world championship staged at the Crucible Theatre in Sheffield since 2026. The fourth is Chinese 8-ball, known internationally as Heyball, led by commercial operators.

On personnel, names such as Nguyen Duc Anh Chien, Ma Minh Cam and Tran Thanh Luc belong to the carom line; Duong Quoc Hoang belongs to the pool line. They wear the same national colours and are all called billiards players, yet they play disciplines that share no common measurement.

These four lines do not share a reference frame. Three-cushion carom is scored by points per inning, on a table with no pockets, and every valid point must touch at least three cushions. Snooker is scored by frames won, with centuries and 147 maximums as the standard of quality. Pool 9-ball is scored in race-to matches. Chinese 8-ball is also scored by racks, but its table and pockets follow a separate standard from the American pool table.

If someone hands me a data column labelled “billiards” without a discipline column, there is nothing I can do with it except hand it back.

When I tried to carry snooker metrics onto a carom table

In my first year in the trade I attempted something naive: using snooker metrics to build profiles of Vietnamese carom players. I took century frequency and consistency across long frames, then applied them to three-cushion matches I had logged. The result was nonsense. No point on a carom table corresponds to a century, because the scoring unit differs, the table geometry differs, and there is no pocket to pot into.

Data never lies, but I have misheard it. What I misheard was not the number itself; it was my assumption that two disciplines share one statistical grammar.

After that I changed my method. Every time I open a carom file, I draft a list of “conditions to verify” before touching any table of numbers: which discipline, which format, what sample size, who measured it, and under what conditions. Only when those four questions have answers do I allow myself a single line of judgment.

Variables that exist in one rulebook only

The break shot is the clearest example. In pool 9-ball it is a decisive part of the match, to the point that a dedicated metric exists for the pot rate after the break. In snooker and three-cushion carom there is no equivalent concept. A sentence claiming “this player has a good break” means something only once we know which discipline he plays.

The jump cue follows the same logic. It is legal in pool, illegal in snooker and carom. The called ball-and-pocket rule is a variable unique to Chinese 8-ball. The Russian pyramid table has pockets only marginally wider than the ball, compressing the margin for error to almost nothing. Those four examples are enough: a dataset without a discipline field carries no technical value, even when every figure inside it is accurate.

Tournament structure and the flow of money

Snooker operates through a ranking-event system and the Triple Crown group, where the number of frames and match length determine the noise level. Three-cushion carom runs on the UMB World Cup circuit, where most matches go to 40 points, so variance inside a short match is far larger than inside a long one. Pool 9-ball is played in race-to formats, with team events such as the Mosconi Cup between Europe and the United States, where psychological pressure differs from that of an individual event.

Chinese 8-ball follows a very different model: one operator holds the event IP while also selling tables and franchising clubs. Prize funds in that cluster run into millions of renminbi, a level most carom World Cups do not reach. I noted that prize-fund figures need re-verification against each season’s official promoter announcement, because they change year by year.

In snooker, income polarisation has been described repeatedly in industry annual reports: a small group of top players takes the bulk of prize money and contracts, while most of the entry list earns prize money that does not cover travel costs. Three-cushion carom has a much smaller total prize pool, so absolute polarisation is lower but precarity is higher. Chinese 8-ball, thanks to operator money, lifts mid-tier earnings — an effect traditional tour structures struggle to produce.

The industry transmission chain also differs across the lines. For carom, money flows from event and academy sponsorship to professional players, but the base layer is the amateur club system. For Chinese 8-ball, the flow reverses: table and accessory sales feed the events, and the events feed brand image. For snooker, broadcast contracts and international sponsors sit at the top.

The layer where my data is thinnest, and the most important one in Vietnam, is the base: the club system. Number of tables, rental hours, new players per month — almost nobody measures it.

One gap in my file remains unresolved. Some players hold steady rankings that the media barely mentions, while others are mentioned constantly with thin ranking results. Measuring the distance between visibility and performance data requires at least three sources: rankings, recent results, and commercial value. I have two of the three in a few cases, so most conclusions stay suspended.

A twenty-session log

Since the start of this year I have done something no organisation asked of me: visit a club for twenty consecutive sessions, hand-recording arrival time, departure time, headcount, the discipline they play, and how many matches they watch. I call it a baseline record, because without it any claim about the sport’s grassroots is just a feeling.

Three thousand matches taught me that one match can teach more than all of them. But three thousand matches taught me the reverse too: without a discipline field, those three thousand matches are just a pile of characters.

The limits of this record are plain. Twenty sessions is far too small a sample to say anything about the whole country. I have no access to ticket or revenue data from any club. The discipline classification is done by my own eye, so subjective error sits inside the very first data column. And the observation window fell in the rainy season, when footfall tends to drop — which may skew the entire trend line. I write those limits down rather than keeping them in my head.

The counter-intuitive angle

Saying “billiards is billiards” is not the carelessness of one spectator. It is the product of an incentive. An umbrella label lets a sponsor buy once and cover several audience groups. It lets a newsroom merge many sources into one section, and lets an article about carom still pull readers who only care about pool.

The cost of the umbrella label falls on the group with the smallest audience. In Vietnam that group is three-cushion carom — the one where we hold genuine international results. Bao Phuong Vinh won the three-cushion world championship in 2026 in Ankara. Tran Quyet Chien spent years among the leaders on the carom World Cup circuit, and the three-cushion world championship has been staged in Binh Duong. But when those results are told under the word “billiards,” they dissolve into a general bucket where readers can no longer separate a pocketless-discipline medal from a recreational billiards boom.

The correlation most easily misread here is the one between club participation and international results. Both curves have risen in recent years, leading many to conclude one feeds the other. I do not have enough data to assert that causal direction. The club curve tracks leisure demand and urban real estate. The international results curve tracks the global tour system, qualification slots and travel budgets. Two different mechanisms, coinciding in time.

One more point I want stated plainly, because it reads easily as an accusation: billiards has thinner integrity-monitoring infrastructure than football. The absence of anomalous signals in public data is not evidence of cleanliness. It is a monitoring gap, and I file it under “to watch,” not under “cleared.”

Signals for the next cycle

Three signals I will track next. First, whether public billiards datasets add a mandatory discipline field — the cheapest and most useful column of all. Second, whether Vietnam’s carom group holds its slots and form on the UMB circuit as the calendar thickens, because more 40-point matches mean more variance. Third, whether the base layer — the club system — finally gets measured properly, or stays entrusted to feeling.

I do not write to persuade anyone. I write so that the data has a witness. And the first witness has to be the column that names the discipline.