Which mahjong are you playing? The variants, and what actually differs

Mahjong is better thought of as a family of games than as one game with regional quirks — closer to the relationship between whist, bridge and hearts than to two football codes. What the variants share is the physical set: suits of characters, bamboo and circles running one to nine, honour tiles, and usually flowers and seasons. What they share conceptually is that you are assembling a hand from sets and drawing and discarding to do it.

Everything after that is variant-specific, and the differences are not cosmetic. Whether a hand needs to be worth a minimum before you may declare it changes what you spend the whole game doing. Whether you may claim another player's discard, and under what conditions, changes the pace completely. And scoring — which is where most of the strategy lives — has essentially nothing in common between the four.

So the first question is not "how do I play mahjong" but "which mahjong am I learning", and the answer is usually decided for you by who you are going to play with.

• Riichi (Japanese) — The variant with the most complete published rule set and by far the most learning material in English, largely because of its competitive and online scene. It has a minimum-value requirement — you cannot simply declare any complete hand — plus the riichi declaration itself, a bet that commits you to a closed hand, and mechanics around dora tiles that reward specific tiles held. Structurally the strictest and the most strategic, and consequently the steepest to learn.
• Hong Kong (Cantonese) — Widely taught as the entry variant because the rules are comparatively few and the games are quick. Sets are claimed from discards freely, hands complete often, and scoring is simpler than riichi without being trivial. If somebody teaches you "mahjong" with no qualifier in Britain, this is most often what they mean.
• American — The most different of the four, and the one most likely to confuse somebody arriving from another variant. Play is organised around an annually published card of permitted hands, joker tiles exist, and the objective is to complete one of the listed hands rather than a generic set-based structure. A game with its own culture and its own leagues, and effectively unplayable from another variant’s knowledge.
• Chinese Official — A modern codified tournament ruleset, sometimes called International. Built for competition with a large catalogue of scoring patterns and a minimum requirement, and consequently precise and demanding. Encountered mostly in tournament settings rather than at kitchen tables.

• Whether a hand needs a minimum value — The biggest structural difference of all. Where a minimum applies — riichi and Chinese Official — a complete hand is not enough and you must build towards value, which changes every decision from the first discard. Where it does not, speed dominates and completing quickly is a winning strategy in itself.
• What you may claim from a discard — All variants let you take a discarded tile in some circumstances, and the circumstances differ. The looser the claiming rules, the faster the game and the less control you have over your own hand shape. This is the difference that most changes how a game *feels* to play.
• How scoring is calculated — Essentially nothing transfers. Riichi counts han and fu; Hong Kong counts faan; Chinese Official uses a large pattern catalogue; American reads a value off the card. Learning a second variant means learning its scoring from scratch, and this is where people who "already play mahjong" come unstuck.
• What the extra tiles do — Flowers, seasons, jokers and dora indicators appear in some variants and not others, and do quite different jobs where they appear. A set bought for one variant may contain tiles the game you are playing does not use, which is normal rather than a defect.

Learn the variant played by the people you will actually play with. This sounds glib and it is the entire answer for most people: mahjong is a four-player game and a variant nobody near you plays is a hobby you will practise alone against software.

Where you have a genuine choice, the trade-off is between learning material and learning curve. Riichi has incomparably the best English-language resources and the largest online population, so you can learn and play at any hour — at the cost of being the most demanding of the four. Hong Kong is the gentlest introduction and the most likely to be what a British club plays, and it teaches the fundamentals that transfer. American is a separate world with its own leagues and is a poor choice if you might later want to play with anybody outside it. Chinese Official is for people who want the tournament game and know that already.

One thing genuinely does transfer: recognising hand shapes, reading discards for what opponents are collecting, and the tile-efficiency instinct for which of two tiles to throw. That is most of what makes a good player and it survives a change of variant. The scoring does not, and expecting it to is what makes a second variant feel harder than the first.