Riichi

Basic Premises

  • Flower and season tiles are not used.
  • Wind rotation after each hand except if East wins or is Tenpai.
  • It is possible to declare Riichi on any hidden hand that only needs one more tile to be a winning hand. 1000 points will be placed, as an extra bet by the player declaring Riichi and the game will play itself until somebody wins or there is a draw. The player who has declared Riichi may expand a pong to a kong if the right tile is drawn. If a player who has declared Riichi declines to go mahjong on a tile is still Riichi, but may then only declare Mahjong on a drawn (not discarded) tile. The winner of the hand takes the extra 1000 points. In case of a draw, the points will be transferred to the next hand.
  • A player will become Furiten if he or she needs a tile that he or she has already discarded to go Mahjong. A player who is Furiten may only declare Mahjong on a self-drawn tile. A player will stop being Furiten if he or she discards tile(s) so that the tile needed for Mahjong is no longer one that he or she has already discarded.
  • The game ends if a player goes below 0 points.
  • A player will be Tenpai if nobody wins and the player is only one tile away from a Mahjong hand.
  • Dora, Kan Dora and Ura Dora are used (see the Special Hands section for details).
  • Red fives are not used in any Riichi rule set on this site.
  • Washout happens if:
  • There are no tiles left in the live wall;
  • All players discard the same wind in the first go-around;
  • Four kongs are declared and nobody robs the last kong and the kongs are not declared by the same player;
  • All players declare Riichi (but see Kansai below).

Variations
We offer Japanese Riichi, EMA Riichi and Kansai style Riichi. EMA and Kansai differ from the standard Riichi rule set as per below.

EMA Riichi

  • All Simples (Tanyao) hand must be closed (i.e. a concealed hand).
  • Blessing of Man (going Mahjong on a discard in the first round) is allowed and is a yakuman.
  • Multiple Ron is allowed.

Kansai Style Three Player Riichi

  • Players are East, South, West – never North.
  • Tiles 2-8 in the characters suit are not in the tile set.
  • A pong of North scores 1 yaku, open or concealed.
  • Players are not allowed to claim discarded tiles to complete a chow, except when going Mahjong.
  • Some yakus, such as Mixed Triple Chow cannot be achieved due to the lack of Character tiles.
  • All Riichi washout is not used – the game continues even if all players have declared Riichi.

Going Mahjong

At least one yaku (fan) is required to go mahjong. See Special Hands below.
Note that losses are limited; a player cannot go below 0 points.

Special Hands
The following special hands score one or more yakus.

Yaku Patterns

NameOpenConc.Description
Riichi1Going out with mahjong after having declared Riichi. One extra yaku is awarded if you go out within the next uninterrupted go-around, inluding your next draw from the wall (Ippatsu). One extra yaku is awarded if riichi was declared in the very first uninterrupted go-around (Daburu riichi).
Fully Concealed Hand (Menzen Tsumo)1Going out on self-draw with a concealed hand.
All simples (Tanyaou Chuu)12A concealed hand consisting only of suit tiles 2-8. (Scores -/1 in EMA Riichi)
Pinfu1A hand that gives no minipoints beside those awarded for going out. The hand must consist of four chiis and a pair which is not in dragons, seat wind or prevalent wind, and the hand must be won on a two-sided wait.
Pure Double Chii (Iipeikou)1Two chiis of the same value and suit.
Mixed Triple Chii (San Shoku Doujun)12Three chiis of the same value, with one in each suit.
Pure Straight (Itsu)12Three consecutive chiis (1-9) in the same suit.
Dragon Pon (Fanpai/Yakuhai)11A pon or kan in dragons
Seat Wind (Fanpai/Yakuhai)11A pon or kan in the players wind.
Prevalent Wind (Fanpai/Yakuhai)11A pon or kan in the prevalent wind.
Outside Hand (Chanta)12A hand where all sets contain a terminal or honor tile, and at least one of the sets is a chii.
After a Kan (Rinchan Kaihou)11Going out on a replacement tile for a kan.
Robbing a Kan (Chan Kan)11Going out by robbing a kan (see ????)
Bottom of the Sea (Haitei)11Going out on the last tile of the live wall, or the discard thereafter.
Seven Pairs (Chii Toitsu)2A hand consisting of seven pairs. Note, that this is one of the two special hands that don’t follow the standard 4 sets plus 1 pair formula. It is also special in that you are awarded 25 points for going mahjong with a seven-pairs hand.
Triple Pon (San Shoku Dokou)22One pon or kan in each of the three suits, all having the same number.
Three Concealed Pons (San Ankou)22Three concealed pons or kans.
All Pons (Toi-toi hou)22A hand with four pons/kans and one pair.
Half Flush (Honitsu)23A hand with tiles from only one suit plus honor tiles.
Little Three Dragons (Shou Sangen)44Two pons/kans of dragons plus one pair of dragons. (No extra yakus are scored for the dragon pons individually.)
All Terminals and Honors (Honroutou)22A hand consisting of only terminals and honors.
Terminals in All Sets (Junchan Taiyai)23A hand with atleast one chii and where all sets contains terminals.
Twice Pure Double Chiis (Ryan Peikou)3Two pair of chiis, where each pair consists of two identical chiis.
Full flush (Chinitsu)56A hand with tile from only one suit and no honor tiles.

 

Yakuman Patterns
Yakuman hands are all treated as 13+ yakus in terms of scoring.

PatternDescription
Thirteen Orphans (Koku Shimusou)One of each honor tile and terminal plus a fourteenth tile forming a pair with one of thos
Nine Gates (Chuuren Pooto)A hand consisting of the tiles 1112345678999 in one suit plus one extra tile in the same
Blessing of Heaven (Tenho)East wins on the initial hand.
Blessing of Earth (Chiho)A hand won on self draw in the first go-around.
Blessing of Man (Renho)A hand won on discard in the first go-around. Only possible in EMA Riichi.
Four Concealed Pungs (Suu Ankou)Four concealed pons or kans.
Four Kans (Suu Kan Tsu)Four kans.
All Green (Ryuu Iisou)A hand consisting of only green tiles, i.e., green dragons and bamboo 2, 3, 4, 6 and 8.
All Terminals (Chinrouto)A hand consisting of only terminal tiles.
All Honors (Tsuu Iisou)A hand consisting of only honor tiles.
Big Three Dragons (Dai Sangen)A pon or kan in each of the three dragons.
Little Four Winds (Shou Suushi)A pon or kan in three of the winds and a pair in the fourth wind.
Big Four Winds (Dai Suushii)A pon or kan in each of the four winds.

 

Dora, Kan Dora and Ura Dora
The face-up tile in the wall is the Dora indicator. The next tile in sequence is the Dora. So if the Dora indicator is Bamboo 2, the Dora is Bamboo 3, if the indicator is Character 9, the Dora is Character 1. If the Dora indicator is a dragon or a wind, the following sequences are used: the dragon sequence is Red, White, Green; the wind sequence is East, South, West, North.

For each Dora tile a player has in a winning hand, one additional yaku is awarded. Only having a Dora tile in ones hand does not make the hand qualify for Mahjong, however.

If a Kan is declared, another tile is turned face up, indicating another Dora tile (a Kan Dora).

If a player has declared Riichi and goes Mahjong, the tile beneath each Dora indicator is exposed. The newly exposed tile(s) indicate Ura Dora(s) which work just like Dora tiles.

Scoring
The final score of a hand is complicated to calculate by hand, so it is presented in the form of tables here. If the winner has less than 5 yaku, minipoints need to be calculated first.

CombinationMinpoints if openMinipoints if concealed
Pong of simples24
Pong of terminals/honors48
Kon of simples816
Kon of terminals/honors1632

 

CombinationMinpoints
Pair of dragons2
Pair of seat wind2
Pair of prevalent wind2
Edge wait, closed wait or pair wait2
Self-draw except with pinfu hand2
Open pinfu2
Wining with concealed hand30
Seven pairs (not cumulative)25
Open hand/self draw20

 

Based on the number of minipoints and yakus in the player’s hand, losers shall pay the points to the winner according to the below tables:

Winner is East and wins on self draw (Tsumo)
Minipoints1 yaku2 yaku3 yaku4 yaku
2070013002600
2516003200
30500100020003900
40700130026004000
50800160032004000
601000200039004000
701200230040004000
801300260040004000
901500290040004000
1001600320040004000

 

Winner is East and wins on discard (Ron)
Minipoints1 yaku2 yaku3 yaku4 yaku
25240048009600
3015002900580011600
4020003900770012000
5024004800960012000
60290058001160012000
70340068001200012000
80390077001200012000
90440087001200012000
100480096001200012000

 

Winner is any wind except East and wins on self draw (S,W,N/East) (Tsumo)
Minipoints1 yaku2 yaku3 yaku4 yaku
20400/700700/13001300/2600
25800/16001600/3200
30300/500500/10001000/20002000/3900
40400/700700/13001300/26002000/4000
50400/800800/16001600/32002000/4000
60500/10001000/20002000/39002000/4000
70600/12001200/23002000/40002000/4000
80700/13001300/26002000/40002000/4000
90800/15001500/29002000/40002000/4000
100800/16001600/32002000/40002000/4000

 

Winner is any wind except East and wins on discard (Ron)
Minipoints1 yaku2 yaku3 yaku4 yaku
25160032006400
301000200039007700
401300260052008000
501600320064008000
602000390077008000
702300450080008000
802600520080008000
902900580080008000
1003200640080008000

 

If the winner has more than 5 yaku, losers pay as follows:

Limit hands
HandYakuEast WinsOther Wind Wins (S,W,N/East)
Mangan540002000/4000
Haneman6-760003000/6000
Baiman8-1080004000/8000
Sanbaiman11-12120006000/12000
Yakuman13+160008000/16000