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2Glossary

2Glossary

WRC = World Riichi Championship
WRCC = World Riichi Championship Committee
WRCR = World Riichi Championship Rules
WRR = World Riichi Rules (aka WRCR)

2.1Terms related to groups

JapaneseMeaning
Groupmentsu面子Group of three or four tiles. Either a chow, pung or kong.
Chowshuntsu順子Group of three consecutive tiles of the same suit.
Concealed chowanjun暗順Chow made with only self-drawn tiles.
Melded chowminjun明順Chow made by calling a tile.
ChiichiiチーDeclaration of calling a tile for making a melded chow.
Pungkōtsu刻子Group or three identical tiles.
Concealed pungankō暗刻Pung made with only self-drawn tiles.
Melded pungminkō明刻Pung made by calling a tile.
PonponポンDeclaration of calling a tile for making a melded pung.
Kongkantsu槓子Group or four identical tiles.
Concealed kongankan暗槓Kong made with only self-drawn tiles.
Melded kongminkan明槓Either a big melded kong or a small melded kong.
Big melded kongdaiminkan大明槓Kong made by calling on a concealed pung.
Small melded kongshōminkan小明槓Kong made by promoting a melded pung.
KankanカンDeclaration of making a kong (either melded or concealed).
Pairtoitsu対子Two identical tiles.


Concealed
A group is concealed if it is made by using only self-drawn tiles.

Melded
A group is melded if it is made by calling a tile.

2.1Terms related to groups

Please stop saying "concealed pon". "Pon" is what you say when making an exposed triplet, so "concealed pon" would mean "concealed exposed triplet", which doesn't make sense.

2.2Terms related to the whole hand

2.2Terms related to the whole hand

Tenpai
A player's hand is tenpai if it fulfils all these conditions:
1) The hand's 13 tiles needs only one more tile to form a complete hand of four groups and a pair, or seven different pairs, or the Thirteen Orphans yaku.
2) The completing tile must exist, even if it's not available.
A hand needing five identical tiles can never be completed, so it is not tenpai.
It does not matter if all completing tiles have been discarded, or are locked in other payer's hands, or are in the dead wall. Only the hand's 13 tiles are considered to determine if the hand is tenpai or noten.
3) The player is not under a "dead hand" penalty.

During the player's turn, the hand's 14 tiles is tenpai if it will fulfil the above conditions after discarding.

Noten
A hand is noten if it is not tenpai.

Winning hand
A player's hand is a winning hand if it fulfils all these conditions:
1) It has four groups and a pair, or seven different pairs, or the Thirteen Orphans yaku.
2) It has at least one yaku.

Tenpai
Examples of condition #2:
Noten:
1pin1man2man3man4man5man6man7man8man9man1pin1pin1pin
This hand needs a 5th 1pin to complete the pair, and nothing else, but there are only four in the tileset, so it is noten.

1sou2sou3sou4sou5souredredredwestwest3sou3sou3sou
This hand could be competed with a 3sou or 6sou. Even if there is no 5th 3sou, the 6sou is still a valid wait, so this hand is tenpai.

9pin9pin9pin9sou9sou9sou9man9man9mangreengreengreensouth (Another player has a South pon.)
Despite there is no south available, this hand is still tenpai.
For determining if a hand is tenpai or noten, you should consider only the hand's tiles. Tiles locked into other players' melds and discarded tiles do not matter.

Closed
A hand is closed if it is made by using only self-drawn tiles, beside the winning tile.
If the hand is completed by calling a tile (ron), the last group or pair is melded but the hand is still closed.

Open
A hand is open if it is not closed.
I.e. a hand is open if it has at least one melded group before the winning tile.
Closed / Open VS Concealed / Melded
You may notice I used "concealed" / "melded" for groups and "closed" / "open" for hands (except for the "Fully Concealed Hand" yaku, due to historical reasons). This is supposed to help differencing those similar, yet different, concepts.

Edit 2016-10-28:
Actually, in a Fully Concealed Hand all groups are concealed, including the last group, so it follows the logic.

2.3Terms related to scoring

Yaku
A yaku is a scoring pattern.
Each yaku gives one or more han.

Dora
Each dora gives one han.

Han
One of the two scoring units used for evaluating the hand.
Earned from yaku and dora.

Minipoints / Fu
One of the two scoring units used for evaluating the hand.
Earned from groups, pairs and winning event.

Hanchan (sometimes called Session)
East and South rounds.

2.3Terms related to scoring

Hanchan score
After each hanchan, the "hanchan score" is calculated as follow, without rounding:
(points - 30,000) / 1,000 + uma

Overall score
For each player, the overall score is the sum of each hanchan scores.
Hanchan score
Remember the starting score for each hanchan is 30,000 points and there is no oka.
If for some reason you play with another starting score (missing sticks for your casual game?), don't forget to adapt the hanchan score calculation:
(points - starting points) / 1,000 + uma
Else, you'll screw the oka.