Rules

Riichi Mahjong Yaku

Learn the conditions and Han value of common Riichi Mahjong Yaku. Each guide distinguishes closed and open hands and calls out mistakes that often change the score.

Values follow common modern Riichi rules. Local and tournament rules may differ, especially for double Yakuman.

1 Han

RiichiA declaration made with a closed hand in tenpai after paying a 1,000-point deposit.Closed hand: 1 HanOpen hand: Closed onlyIppatsuA win within the first uninterrupted turn after declaring Riichi.Closed hand: 1 HanOpen hand: Closed onlyMenzen TsumoA self-drawn win with a hand that has remained closed.Closed hand: 1 HanOpen hand: Closed onlyAll SimplesA hand made entirely from numbered tiles 2 through 8, with no terminals or honors.Closed hand: 1 HanOpen hand: 1 HanYakuhaiA triplet or quad of dragons, the prevailing wind, or the player’s seat wind.Closed hand: 1 HanOpen hand: 1 HanAfter a KanA Tsumo win on the replacement tile drawn immediately after declaring a Kan.Closed hand: 1 HanOpen hand: 1 HanRobbing a KanA Ron win on a tile another player adds to an existing open triplet to make a Kan.Closed hand: 1 HanOpen hand: 1 HanPinfuA closed, all-sequence hand with no fu from its pair, melds, or wait.Closed hand: 1 HanOpen hand: Closed onlyPure Double SequenceTwo identical sequences in the same suit, completed in a closed hand.Closed hand: 1 HanOpen hand: Closed onlyUnder the SeaA Tsumo win on the final drawable tile of the live wall.Closed hand: 1 HanOpen hand: 1 HanUnder the RiverA Ron win on the final discard after the last live-wall draw.Closed hand: 1 HanOpen hand: 1 Han

2 Han

Double RiichiA Riichi declaration made on the player’s first uninterrupted turn.Closed hand: 2 HanOpen hand: Closed onlyAll TripletsFour triplets or quads and a pair, with no sequences.Closed hand: 2 HanOpen hand: 2 HanSeven PairsA closed hand made from seven distinct pairs instead of four groups and a pair.Closed hand: 2 HanOpen hand: Closed onlyThree Concealed TripletsA hand containing three triplets or quads completed without calling another player’s tile.Closed hand: 2 HanOpen hand: 2 HanLittle Three DragonsTwo dragon triplets or quads plus a pair of the third dragon.Closed hand: 2 HanOpen hand: 2 HanHalf Outside HandEvery group and the pair contains a terminal or honor, with at least one sequence and at least one honor.Closed hand: 2 HanOpen hand: 1 HanMixed Triple SequenceThe same numbered sequence appears once in each of the Man, Pin, and Sou suits.Closed hand: 2 HanOpen hand: 1 Han

3 Han

Fully Outside HandEvery group and the pair contains a terminal, with at least one sequence and no honors.Closed hand: 3 HanOpen hand: 2 HanHalf FlushA hand made from one numbered suit together with honor tiles.Closed hand: 3 HanOpen hand: 2 Han

6 Han

Full FlushA hand composed entirely of one numbered suit, with no honor tiles.Closed hand: 6 HanOpen hand: 5 Han

Yakuman

Four Little WindsThree wind triplets or quads plus a pair of the fourth wind.Closed hand: YakumanOpen hand: YakumanFour Concealed TripletsFour concealed triplets or quads and a pair, completed without opening the hand.Closed hand: YakumanOpen hand: Closed onlyThirteen OrphansOne of every terminal and honor tile, plus a duplicate of any one of those thirteen tiles.Closed hand: YakumanOpen hand: Closed onlyNine GatesA closed, single-suit hand based on 1112345678999 plus one extra tile of that suit.Closed hand: YakumanOpen hand: Closed onlyFour Big WindsTriplets or quads of all four wind tiles: East, South, West, and North.Closed hand: YakumanOpen hand: Yakuman