A yaku is a certain pattern in a mahjong hand, or a special condition under which a win is declared.
A player requires at least one yaku to declare a win.
The game rules define lots of different yaku, worth a different amount of han based on their difficulty. A player can incorporate several different yaku in the same hand and add their han values for high-scoring hands.
Dora are not considered yaku, even though they provide han. A hand having no yaku may not win, even if it has multiple dora.
One han closed only
| Yaku
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Japanese
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Open/Closed
[[Menzen tsumo]]
- 「門前清自摸和」
- Closed only
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This yaku may apply to any closed hand. Any player who draws a winning tile with a closed hand is awarded this yaku.
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[[Riichi]]
- 「立直」
- Closed only
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This is a special yaku applied to closed tenpai hands, which requires the player to make a declaration and "wager".
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[[Ippatsu]]
- 「一発」
- Closed only
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This is applied when the player calling riichi wins within 4 tile draws/discards. In addition, the cycle must not be interrupted by tile calls.
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[[Pinfu]]
- 「平和」
- Closed only
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Typically known as "all sequences", this is a hand that does not gain fu based on composition, other than that of a closed ron.
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            Agari:  or 
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[[Iipeikou]]
- 「一盃口」
- Closed only
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This hand includes two identical sequences.
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One han
| Yaku
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Japanese
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Open/Closed
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| Haitei raoyue
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海底撈月
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May be open
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| The hand is completed with the last tile on the wall.
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| Houtei raoyui
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河底撈魚
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May be open
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| The hand is completed with the very last discarded tile.
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| Rinshan kaihou
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嶺上開花
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May be open
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| This yaku is awarded upon winning with a tile from the dead wall.
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| Chankan
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搶槓
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| The winning tile for a hand is called on another player's Kan. Essentially, the tile needed to complete a Kan is stolen to complete a winning hand.
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| Tanyao
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断幺九
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May be open (Closed only on variation)
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 Agari: or
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| A hand composed of only inside (numbers 2-8) tiles
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| Yakuhai
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役牌
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May be open
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     Agari: or
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| A hand with at least one group of dragon tiles, seat wind, or round wind tiles. This hand can be valued at 1 han for each group.
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Two han
| Yaku
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Japanese
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Open/Closed
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| Double riichi
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ダブルリーチ
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Closed only
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| Riichi is declared with a dealt hand before the first discard.
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| Chanta
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全帯幺九
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May be open (Loses 1 han)
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      Agari: or
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| All melds contain at least 1 terminals or honor.
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| Sanshoku
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三色同順
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May be open (Loses 1 han)
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    Agari:
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| Three sequences have the same number across the three different suits.
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| Ittsu
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一通貫
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May be open (Loses 1 han)
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| This hand has a complete sequence of 1 through 9 of a single suit. As a note, the sequence of 1-9 are actually three groups of sequences numbered 123, 456, and 789.
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| Toitoi
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対々
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May be open
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 Agari: or
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| The entire hand is composed of triplets.
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| Sanankou
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三暗刻
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May be open
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 Agari: or
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| The hand includes three sets of triplets that have been formed without calling any tiles. The fourth set can be an open triplet or sequence.
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| Sanshoku doukou
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三色同刻
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May be open
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   Agari:
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| The hand includes three groups of triplets with the same number.
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| Sankantsu
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三槓子
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May be open
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   Agari:
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| Three kans are called for this hand.
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| Chiitoitsu
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七対子
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Closed only
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 Agari:
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| This hand is composed of seven pairs. It is one of two exceptions to the standard 4 melds and a pair pattern.
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| Honroutou
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混老頭対々和
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May be open (Consider as 4 han †)
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| Agari: or
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| The hand is composed of nothing but all terminals and honors. This hand may be considered as 4 han, because it is impossible to score this hand without either chii toitsu or toi toi.
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| Shousangen
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小三元
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May be open (Consider as 4 han †)
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  Agari: or
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| The hand contains two sets of 3 dragon tiles and a pair of the third dragon tiles. This hand may be considered as 4 han, because it is impossible to score this hand without two sets of yakuhai, from the two sets of dragons.
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Three han
| Yaku
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Japanese
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Open/Closed
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| Honitsu
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混一色
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May be open (Loses 1 han)
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| Agari: or
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| This is a single suit hand mixed with some honor tiles.
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| Junchan
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純全帯么
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May be open (Loses 1 han)
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 Agari:
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| All sets contain at least one terminal.
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| Ryanpeikou
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二盃口
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Closed only
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| Agari:
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| This hand has two sets of "iipeiko". This hand does not combine with chii toitsu, even though the hand can be interpreted as one.
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Six han
| Yaku
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Japanese
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Open/Closed
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| Chinitsu
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清一色
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May be open (Loses 1 han)
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 Agari: or
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| This hand is composed entirely of tiles from only one of the three suits. It is the only yaku set at 6 han, where the number drops to 5 han when opened.
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Yakuman
| Yaku
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Japanese
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Open/Closed
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| Kazoe yakuman
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数え役満
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May be open
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| This is a special class of yakuman, where a hand is composed of 13+ han based on the combination of above regular yaku and/or dora.
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| Kokushi musou
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国士無双 or 国士無双１３面待ち
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Closed only
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| Agari:
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| This hand has one of each of the 13 different terminal and honor tiles plus one extra terminal or honour tile. Some rules may allow double yakuman for a 13-wait set.
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| Suuankou
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四暗刻 or 四暗刻単騎
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Closed only
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| Tsumo: or
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| This hand is composed of four sets of closed triplets. When this hand has a shanpon pattern and the win is via ron, then it would not be counted as suu ankou.
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| Daisangen
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大三元
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May be open
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 Agari:
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| This has possesses three groups of all the dragons.
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| Shousuushi
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小四喜
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May be open
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  Agari:
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| This hand has three groups of the wind tiles plus a pair of the fourth kind.
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| Daisuushi
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大四喜
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May be open
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| Agari:
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| This hand has four groups of all four wind tiles.
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| Tsuuiisou
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字一色
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May be open
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 Agari: or
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| Every group of tiles are composed of honor tiles.
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| Chinroutou
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清老頭
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May be open
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 Agari: or
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| Every group of tiles are composed of terminal tiles.
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| Ryuuiisou
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緑一色
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May be open
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| Agari: or
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| A hand composed entirely of green tiles: 2, 3, 4, 6 and 8 Sou and/or Hatsu.
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| Chuuren poutou
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九連宝燈 or 純正九蓮宝燈
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Closed only
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| Agari: Any manzu.
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| A hand consisting of the tiles 1112345678999 in the same suit plus any one extra tile of the same suit.
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| Suukantsu
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四槓子
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May be open
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 Agari:
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| This hand with four Kan's.
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Initial yakuman
| Yaku
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Japanese
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Open/Closed
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| Tenhou
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天和
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Closed only
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| The dealer hand is a winning hand even before discarding a tile.
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| Chiihou
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地和
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Closed only
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| The non-dealer hand is a winning hand after the first draw.
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Special case
This yaku does not specifically deal with a player's hand, but rather the player's discards. In addition, the hand may or may not be at tenpai upon scoring. By default, this hand is set to mangan.
| Yaku
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Japanese
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Open/Closed
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| Nagashi mangan
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流し満貫
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Closed only
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| All the discards are terminals and/or honors. In addition, none of these discards were called by other players.
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Optional
| Yaku
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Japanese
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Open/Closed
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| Renhou
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人和
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Closed only
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| A non-dealer player wins on a discard at the first round. Variance may set this to mangan, or not used at all.
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External links
- Lists all the yaku occurrences in Tenhou.net by percentages and by room
- Pointing out which yaku to learn first
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| | Closed only Yaku - 1 han | | |
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| | Yaku - 1 han | |
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| | Yaku - 2 han | |
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| | Yaku - 3 han | |
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| | Yaku - 6 han | |
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| | Yakuman | |
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| | Special | |
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| | Optional | |
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| | Topics | |
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Agari: 
Agari: 
Agari: 