Riichi Mahjong Trainer
Free riichi mahjong study platform — bilingual explainer guides, the full 28-yaku reference, a shanten calculator, a shanten quiz and a points calculator.
A fresh yaku check every day — decide first, then reveal.
234m 567m 345p 678s 55s
Reveal answer
Every tile is 2-8 of a numbered suit. No terminals, no honors. Tanyao scores whether the hand is open or closed (under kuitan rules).
Read the full explainer →Popular yaku
Browse all →Chuuren Poutou (Nine Gates)
YakumanYakuman. A closed flush of the form 1-1-1-2-3-4-5-6-7-8-9-9-9 in a single suit, plus any one of 1-9 of that suit. Mathematically a chinitsu by construction. The 9-way wait (junsei chuuren) pays double yakuman in stricter rulesets.
Tsuuiisou (All Honors)
YakumanYakuman. A hand composed entirely of honor tiles — winds and dragons only. Often built around a chiitoitsu shape because honors form pairs more easily than triplets. Stacks with honroutou and (sometimes) shousangen for double yakuman in stricter rulesets.
Riichi
1 HanDeclared on a closed tenpai hand by discarding sideways and betting 1000 points. Locks the hand and unlocks a chance for ippatsu and uradora.
Ryanpeikou (Two Pairs of Identical Sequences)
3 HanA closed hand containing two separate pairs of identical sequences (two iipeiko shapes). 3 han, closed-only. Mathematically a chiitoitsu shape, so most rulesets do not let a hand score iipeiko twice instead — ryanpeikou simply replaces the would-be 2 han stack.
Daisangen (Big Three Dragons)
YakumanYakuman. Triplets (or kans) of all three dragon tiles — white, green and red. Often grown from a shousangen tenpai by upgrading the dragon pair into the third triplet. Open-friendly: most rulesets pay full yakuman regardless of calls.
Ippatsu
1 HanWinning within one go-around after declaring riichi, before any call or kan interrupts the turn. Closed-only by virtue of requiring riichi, and one of the cheapest ways to add a free han to a riichi hand — it stacks freely with everything else riichi unlocks.
What you can do here
Learn the Yaku
Master every scoring hand with illustrated examples and common mistakes.
Shanten Calculator
Analyze any hand and see how far you are from tenpai.
Shanten Quiz
Random 13-tile hand each round — guess how far it is from tenpai across all three winning forms.
Points Calculator
Turn han, fu, role and win type into the canonical riichi payout — including the per-player breakdown.
Where to start
Four short paths through the site — pick the one that matches where you are in your riichi journey.
Start with the basics
Understand what tenpai means, declare riichi to lock in your hand, and see how calls change the rules of the road.
How to declare riichi →Learn the scoring patterns
Browse 28 yaku organised by han value, then see how dora multiplies the value of every winning hand.
Browse all yaku →Practice reading hands
Random 13-tile hand each round. Guess how far it is from tenpai, then see the breakdown across all three winning forms — fastest way to train your eye.
Open the shanten quiz →Analyze a hand you're stuck on
Type or click in a 13-tile hand from your own game and the shanten calculator shows exactly how far you are from tenpai under standard, chiitoitsu and kokushi.
Open the shanten calculator →Common questions
Is riichi mahjong hard to learn?
The basic flow is simple: draw a tile, discard a tile, try to assemble four melds and a pair. The deeper part is learning yaku and reading opponents' discards — and that is exactly what this platform helps you train.
How long does a game of riichi mahjong take?
An East-only round (tonpuusen) is about 30-40 minutes; a full East-South round (hanchan) runs 60-90 minutes. The shanten calculator and yaku reference are designed to fit between rounds when you want a quick review.
Do I need to know all 28 yaku to play?
No. Start with the high-frequency 1-han yaku — riichi, tanyao, yakuhai and pinfu cover the majority of wins. The yaku list groups every pattern by han value so you can drill the basics before tackling yakuman.
How is riichi mahjong different from Chinese mahjong?
Riichi is the Japanese ruleset: fixed scoring patterns (yaku), the riichi declaration, dora bonus tiles, and a clear self-draw / discard-win distinction. Chinese variants (national standard, Sichuan, Cantonese) differ in scoring rules, allowed melds, and whether yaku are required at all. This site focuses on the Japanese rules.