Riichi Yaku Reference
Every standard yaku in Japanese Riichi mahjong, with han values (closed and, where it drops, open) and a short description. Optional local yaku like renhou aren’t listed, and nagashi mangan appears as a reference entry — it’s a drawn-round score the calculator doesn’t detect.
- Riichi (立直)1 han
Declared a closed-hand tenpai by betting 1000 points.
- Pinfu (平和)1 han
All chows + non-yakuhai pair + two-sided wait + closed hand.
- Tanyao (断幺九)1 han
All simples — no terminals or honors anywhere in the hand.
- Iipeikou (一盃口)1 han
Two identical chows in the same suit. Closed hands only.
- Yakuhai (役牌)1 han
A triplet of dragons, your seat wind, or the round wind.
- Ippatsu (一発)1 han
Win within one turn after declaring riichi without any calls.
- Menzen Tsumo (門前清自摸和)1 han
Self-draw on a closed hand.
- Haitei Raoyue (海底撈月)1 han
Self-draw the very last tile of the wall.
- Houtei Raoyui (河底撈魚)1 han
Win on the final discard of the round.
- Rinshan Kaihou (嶺上開花)1 han
Win on the replacement tile drawn after declaring a kan.
- Chankan (搶槓)1 han
Win by claiming a tile someone added to make a kan.
- Double Riichi (両立直)2 han
Riichi declared on your first uninterrupted draw.
- Chiitoitsu (七対子)2 han
Seven different pairs.
- Chanta (混全帯幺九)2 han · 1 open
Every set contains a terminal or honor, including at least one chow.
- Honroutou (混老頭)2 han
Every tile is a terminal or honor — always pairs with toitoi or chiitoitsu.
- Sankantsu (三槓子)2 han
Three kans declared by one player.
- Sanshoku Doukou (三色同刻)2 han
Three triplets of the same rank in each of the three suits.
- Sanshoku Doujun (三色同順)2 han · 1 open
Three identical chows in each of the three suits.
- Ittsu (一気通貫)2 han · 1 open
1-2-3 + 4-5-6 + 7-8-9 chows all in the same suit.
- Toitoi (対々和)2 han
All triplets (no chows).
- San'ankou (三暗刻)2 han
Three concealed triplets.
- Shousangen (小三元)2 han
Two dragon triplets + dragon pair.
- Honitsu (混一色)3 han · 2 open
All tiles are one suit + honors.
- Junchan (純全帯幺九)3 han · 2 open
Every set contains a terminal — no honors.
- Ryanpeikou (二盃口)3 han
Two pairs of identical chows. Closed hands only.
- Nagashi Mangan (流し満貫)mangan
Reach the exhaustive draw with every one of your discards a terminal or honor, none claimed — scores a fixed mangan. Reference only: the calculator scores completed hands, so it doesn't detect this one.
- Chinitsu (清一色)6 han · 5 open
All tiles are a single suit.
- Kokushi Musou (国士無双)13 han
Thirteen orphans — one of each terminal and honor, plus a pair.
- Suuankou (四暗刻)13 han
Four concealed triplets.
- Suukantsu (四槓子)13 han
Four kans declared by one player.
- Daisangen (大三元)13 han
Three dragon triplets.
- Shousuushii (小四喜)13 han
Three wind triplets + a wind pair.
- Daisuushii (大四喜)13 han
Four wind triplets.
- Tsuiisou (字一色)13 han
All honors.
- Chinroutou (清老頭)13 han
All terminals.
- Ryuuiisou (緑一色)13 han
All-green — only 2,3,4,6,8s and 6z.
- Chuuren Poutou (九蓮宝燈)13 han
1112345678999 of one suit, plus any tile of that suit.
- Tenhou (天和)13 han
Blessing of Heaven — the dealer's initial fourteen tiles form a winning hand before any discard.
- Chiihou (地和)13 han
Blessing of Earth — a non-dealer wins on their very first draw, before any call interrupts.