Yaku list

A yaku (役) is a particular hand combination. It is necessary to have at least one yaku in order to win. Yaku can be awarded also on particular situations, not only by hand combination. The value of a Yaku is expressed in Han. They are used used to calculate the score. Having more han will result in bigger score.
Is it possible to have more yaku in a hand. In that case the Han value is added up.

Yaku situations

Menzen tsumo (メンゼンツモ / 門前清模和)

English names: Self-pick, Closed Tsumo

Han: 1

When a player has a concealed hand and then draws the winning tile from the wall to complete it.

Riichi (リーチ / 立直)

English names: Reach, Ready

Han: 1

A Riichi is a special declaration of being in Tenpai that is also a 1 Han Yaku. Any time a hand is concelead and in Tenpai, a Riichi can be declared.
To do so, the player says “riichi”, places a 1000-point stick on the table as a deposit, and discards its tile sideways.
From this point on, the player may not change the content of their hand. They must discard any tile that does not allow them to win. One exception: if the player has a three of a kind and they draw the fourth tile to complete a four of a kind, they may declare a kan as long as it does not change the wait of the hand.

Ippatsu (一発)

English names: One-shot, Instant
Han: 1

When a player declares riichi and then receives the winning tile within one round of play, or before the round is interrupted by call. The tile can either be a discard from another player or drawn from the wall.

Double Riichi (ダブルリーチ)

English names: Double Reach, Double Ready
Han: 2

Double Reach is a Reach declared on the first discard (with no Pon, Chi, or Kan before first draw). All Reach rules apply.

Haitei Raoyue (ハイテイ / 海底撈月)

Literal Translation: to dip up the moon from the seabed.
English names: last tile Tsumo, last tile from the wall
Han: 1

Winning on the last legal tile in the wall.

Houtei Raoyui (河底撈魚)

Literal Translation: to dip up a fish from the riverbed.
English names: last tile ron, last discard
Han: 1

Winning on the last discard of a player.

Rinshan kaihou (嶺上開花)

Literal Translation: a flower blooms on a ridge.
English names: out on extra tile draw
Han: 1

When a player declares a quad, they must draw a supplemental tile from the dead wall to keep the number of tiles in the hand consistent. If that tile completes the hand, it adds one han to the hand’s value.
A possible rule for this yaku: if the player uses a discard to complete a quad, then completes their hand with a tile from the dead wall, the player who discarded the tile is responsible for paying the entire amount for the hand. The rule is called pao (包).

Chankan (搶槓, 槍槓)

English names: Robbing a kan
Han: 1

If a player has an open three of a kind and draws the fourth tile in the set to make a four of a kind, they can add it to the triplet. However, if another player requires that tile to complete their hand, they can Ron with that tile. In this case the win is considered a Ron from the player who declared the Kan.

Nagashi Mangan (流し満貫)

English names: Honorable discard
Value: Mangan

The discards of a player are all terminals and honours. The round must be a draw. Often recognized only if none of the discards of that player was called. The hand doesn’t need to be in tenpai. As for the payment, the hand is regarded as a winning by tsumo. The rule of nou ten bappu is usually not applied to this case.

Yaku Hands

This is the list of yaku hands ordered by han value.
Some hands must be closed to be yaku, some lower their value if are open.

Pinfu (ピンフ / 平和)

English names: All sequence, No points, Peace
Must be concealed: yes
Han: 1
  
  • A hand with no three or four of a kinds (all sequences and a pair).
  • The pair must value 0 points.
  • The waiting must an open wait (on 2 different tiles).

Tanyao (断么九 / タンヤオ)

English names: All simples, Inside Hand, End-less
Must be concealed: no*
Han: 1

A hand with no terminal and honour tiles, that is every tile in the hand is a suit tile between 2 and 8.

*Open Tanyao is called Kuitan (食いタン / 喰いタン). Some rulesets forbid Kuitan.

Iipeikou (イーペーコー / 一盃口) aka “Double Sequence”

English names: Double Sequence, Double Run
Must be concealed: yes
Han: 1

Two completely identical sequences in the same suit.
It does not combine with Chiitoitsu.

Fanpai (翻牌) or Yakuhai (役牌)

English names: Special tiles
Must be concealed: no
Han: 1

Any set that includes either a dragon, the player’s own wind,
or the wind of the round. 1 han for each of these set. (A double wind gives two han, accordingly.)

Sanshoku doujin (三色同順)

English names: Triple Run, Three colour straight
Must be concealed: no
Han: 2 / 1 if not concealed.

The same sequence in three suits.

Ikkitsuukan (一気通貫)

Also called: ittsuu (一通)
English names: Straight through, Straight
Must be concealed: no
Han: 2 / 1 if not concealed.

Three sets of same suit: 123, 456, 789.

Chantaiyao (全帯么)

Also called: Chanta (チャンタ / 全帯)
English names: Half Outside, Terminal or honor in each set, End-full
Must be concealed: no
Han: 2 / 1 if not concealed.

Every set must have at least one terminal or honour tile, and the pair must be of a terminal or honour tile. Must contain at least one sequence (123 or 789).

Honroutou (混老頭)

English names: Dirty Terminals
Must be concealed: no
Han: 2

All tiles are terminals or honours. (Since this hand will have also Toi Toi or Chiitoitsu, remember to add 2 han for those hands). Chiitoitsu version is called Honroochiitoi.

Toitoihō (対々和)

Also called: Toitoi (対々)
English names: Double Double, All Triplets
Must be concealed: no
Han: 2
  

The hand consists of all threes or fours of a kind (and of course a pair); no sequences.
Note that if this hand is closed, it will also score for Sanankou.

San ankou (三暗刻)

English names: Three concealed triplets,
Must be concealed: no
Han: 2
     

Three threes or fours of a kind, that are entirely drawn from the wall. (The other
sets and pair need not to be closed.)

San kantsu (三槓子)

English names: Three quads
Must be concealed: no
Han: 2
[p1][p1][m4][m5][m6]         

The hand contains three fours of a kind. They can be open or closed. Some rulesets value this hand as 3 Han.
Can be combined with Toitoi, San ankou.

Sanshoku doukou (三色同刻)

Also called: Sanshoku doupon (三色同ポン)
English names: Three colour triplets
Must be concealed: no
Han: 2

Three triplets consisting of the same numbers in all three suits. Some rulesets value this hand as 3 Han.

Chiitoitsu (七対子 / チートイツ)

Also called: Chiitoi (七対)
English names: Seven pairs
Must be concealed: yes (can’t be open anyway)
Han: 2

A hand composed of seven pairs. All pairs must be distinct (that is, four of kind is not considered two pairs)
This is one of the special hand that break the rule of four sets and a pair (other being Kokushimusou).

Shou Sangen (小三元)

English names: Little three dragons
Must be concealed: no
Han: 2

Two three of a kind of two dragons, plus a pair of the third dragon. (Remember to add 2 han for the 2 Fanpai)

Honitsu (混一色)

Also called: Honisou
English names: Dirty Flush, Half Flush
Must be concealed: no
Han: 3 / 2 if not concealed

The hand contains tiles from a single suit plus honours.

Junchan tayao (純全帯么)

Also called: Junchan (純チャン)
English names: Terminal in each set, full outside
Must be concealed: no
Han: 3 / 2 if not concealed

Every mentsu must have at least one terminal, and the pair must be of terminals. No honours present. Must contain at least one shuntsu (123 or 789).

Ryanpeikou (二盃口)

English names: Double-Double Run
Must be concealed: yes
Han: 3

The hand contains two different Iipeikou’s. Must be concealed. Cannot be combined with Chiitoitsu. (Actually the hand value is one han, plus two han from each of the IIpeikou’s.)

Chinitsu (清一色)

Also called: Chinisou, Chinichi
English names: Full Flush
Must be concealed: no
Han: 6 / 5 if not concealed.

All tiles are of the same suit.

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