Five Rule Sets Under One Name: The Statistical Trap of Vietnamese Billiards

In a room in Nha Trang, the player stands still over the table longer than the shot needs to complete its journey. Three balls sit apart on the green cloth. Between them lies a gap only the man standing at that angle can see. He bends, strokes. The cue ball touches the first cushion, the second, the third, then finds the object ball. The click is dry and short. Then silence returns to its place.

A few blocks away, another room is still lit. The table has pockets. The balls are smaller. The player must call the pocket before the cue touches the ball. Two rooms, two rule sets, two tournament systems, two revenue streams, two kinds of people. In Vietnam, one word covers both: bida. That word is the source of nearly every distortion in the analysis I have read over fifteen years.

In English, billiards is broad too, but professionals split it immediately: snooker, carom, pool, heyball, pyramid. Writers on Vietnamese billiards rarely do. After a medal, the headline reads that Vietnamese billiards has reached the world, without saying which rule set the medal came from. After a wave of new billiard halls opens, the conclusion is that the sport is rising, without asking what tables those halls installed. This blurring is a methodological error, not a linguistic one. In my trade — documentary scriptwriting with a statistics degree, covering billiards for Vietnamese readers — methodological errors are the most expensive kind, because they make no noise.

Billiards in Vietnam currently exists in five main rule families, and each is a separate technical world.

Carom, known locally as bida phang, includes one-cushion and three-cushion, played on a pocketless table with a 2.84 m by 1.42 m playing surface and 61.5 mm balls. No pockets means no natural stopping point for the cue ball; every point comes from cushion geometry and position control.

Snooker uses the largest table in the family: a 3.57 m by 1.78 m playing surface, very tight pockets, and the smallest balls of the mainstream codes at roughly 52.5 mm, with fifteen reds and six colours. This is the rule set of structure and endurance.

Pool, most commonly 8-ball, 9-ball and 10-ball, uses a table of about 2.54 m by 1.27 m, wide pockets, 57.15 mm balls, and called-pocket rules. Chinese billiards, also called heyball, is a hybrid: a pool-sized table with snooker-style pockets and sixteen balls. Russian billiards, or pyramid, uses noticeably larger balls and pockets without drop chutes.

Five rule sets, five skill distributions. The skills that decide matches in carom, snooker, 9-ball pool and heyball are four different sets that barely overlap. Combining them into a single Vietnamese billiards index produces a statistical average that does not exist in reality.

In three-cushion carom, the vital metric is the average per inning. Under the scoring system of the Union Mondiale de Billard (UMB), World Cup formats are played to 40 points with a maximum of 40 innings per player; the leading group holds roughly 1.5 to 2.0, while most professionals hover between 1.0 and 1.2. The gap between 1.2 and 1.5 looks small, but it is equivalent to shortening a forty-point match to about thirty innings. In this discipline, one tenth of a cushion per inning is a whole tier of class.

Based on my experience tracking matches at domestic carom events and World Cup rounds featuring Vietnamese players, the quality of public data is the biggest obstacle. Scoreboards show the final average, but very few venues preserve the inning-by-inning distribution of cushion counts — the data that reveals whether a player won by sustaining a rhythm or by three explosive innings.

Vietnam has a strong tradition in precisely this rule set. According to data published by the UMB, Tran Quyet Chien won the individual three-cushion world championship in 2026 in Cairo, Egypt — Vietnam's first milestone at world level in an individual event. The generation alongside him — Ngo Dinh Nai, Ma Minh Cam, Duong Anh Vu, Nguyen Quoc Nguyen, Chiem Hong Thai, Nguyen Duc Anh Chien — keeps Vietnam regularly present in the late rounds of the World Cup system.

The match truly begins the moment the ball lies still.

In pool, the picture is different. Duong Quoc Hoang is the most cited name, and his career exposes the structural problem of this rule set in Vietnam: a player good enough for international competition, but with very few domestic events of sufficient standard to sustain form all year. Nine-ball is the code with the highest variance. Only one ball is legal as the object ball on each turn, so break quality and the post-break layout shape results more strongly than long-term position play. In short-race formats, that variance is wide enough for a player outside the top 50 to beat a top-5 player in a single evening.

In snooker, Vietnam is almost absent from international rankings. The cause is not cueing ability. It is cost. A standard snooker table occupies twice the floor area of a pool table, demands more expensive cloth, more precise pocket cutting, and yields far fewer playing hours per operating hour. For a hall owner, that is an economic problem, not a question of passion.

In Chinese billiards, the money sits on the other side of the border. Heyball events in China have prize structures far larger than the domestic circuit, and that is one reason part of Vietnam's younger generation has switched to training in this code. But heyball demands something pool does not: safety discipline. Tight pockets, sixteen balls, called pockets, and a wild shot is punished with a locked-down table.

A quick comparison table, to show the scale of the difference:

| Rule family | Table | Ball diameter | Balls | Decisive factor | |---|---|---|---|---| | Three-cushion carom | 2.84 x 1.42 m, no pockets | 61.5 mm | 3 | Cushion geometry, position | | Snooker | 3.57 x 1.78 m, tight pockets | 52.5 mm | 22 | Frame structure, endurance, safety | | 9-ball pool | 2.54 x 1.27 m, wide pockets | 57.15 mm | 10 | Break, ball order, variance | | Chinese billiards | 2.54 x 1.27 m, snooker-cut pockets | 57.15 mm | 16 | Safety, called pockets, precision | | Russian billiards | 2.54 x 1.27 m, pockets without chutes | 68 mm | 16 | Power, precision, cushion control |

I include this table to prove one thing. When an article states that Vietnamese billiards is developing, the writer has added together five skill distributions, five cost structures, five revenue streams, and five groups of athletes who can barely be converted into one another. That is a wrong sum.

A more accurate sum must be split into three layers. The performance layer: Vietnam is genuinely strong in carom. The infrastructure layer: pool and heyball tables have the highest density. The audience layer: carom has a fast rhythm, a few seconds per inning, a match under half an hour, suited to streaming platforms; snooker is slow and structurally long, suited to traditional television but expensive; 9-ball has the fastest rhythm and the widest emotional range, suited to arenas but hard to build long-term narrative because results swing hard.

These three layers do not flow in the same direction. And almost every policy misstep in this sport comes from reading one layer as another.

What the naked eye misses: the boom in the number of billiard halls in Vietnamese cities over the past decade is usually read as an indicator of competitive sport. Hall density is an indicator of the entertainment market — of disposable income, of youth culture, of commercial rents. A city with more billiard halls is not necessarily a city with more athletes. People buying table time and people training are two different groups, following two different curves.

And here is the paradox I consider most important. The cheapest rule set to operate — three-cushion carom, with three balls and a table that needs no pocket cutting — is the rule set that produced almost all of Vietnam's international achievements. The most expensive rule set — snooker — has produced almost nobody. Vietnam's top results do not come from where the most money is, but from where the operating structure is simplest, allowing a young player the most hours on the table at the lowest cost.

That sounds like good news. It has a reverse side. If Vietnam's carom success depends on a cheap cost structure rather than an organised development system, it depends on luck in personnel. Looking at the ages of the core group over the past years, the successor generation is far thinner than the one currently competing. This is the typical structure of a sport that grows through grassroots enthusiasm: the peak arrives early, and the peak conceals an unmeasured pipeline.

Another blind spot: medals are counted by the umbrella sport of billiards, not by rule set. At a major Games, a carom medal, a pool medal and a snooker medal sit side by side on the same table, as if they measured the same capability. Coaches know they do not. Policymakers often do not.

During 2026 and 2026, when halls and tournaments closed, I went through three hundred and ninety-eight days without hearing balls collide at close range. I reread my old notebooks and found a line written when I was still doing statistics for a local club: too much emotion, too little data. Years earlier, an editor had written exactly that sentence on my rejected manuscript. Only then did I understand he was not criticising my prose; he was warning me about a professional error — telling a beautiful story about data I did not yet have.

Since then, whenever I take on a piece about Vietnamese billiards, I ask one question first: which rule set? The answer determines everything downstream — the table, the balls, the coaching, the sponsor, the audience.

There are pots that never appear on the scoreboard, but live in the breathing of the arena.

I learned to read matches through metrics, but only when those metrics know how to dance. A metric only dances when we know which rule set it belongs to. Every stroke is a whisper, and a season is a long conversation. The lines of the balls, to me, carry the shape of a sacred language — but a language needs grammar, and the grammar of carom is not used to write sentences in snooker.

The next decade of Vietnamese billiards will not be decided by how many new halls open, nor by an aggregated medal count. It will be decided by whether someone separates the five rule sets, and gives each its own data system, its own development pipeline, its own yardstick. The rule set that is called by its true name will be the rule set that grows.

When a child in Nha Trang walks into a billiard hall for the first time, she does not know which rule set she is walking into. Who will tell her?