Rules

TORI uses rules largely based on the rules used by the WRC. Two sets of rules are in use for in-person play: one for casual gameplay, and one for tournament gameplay. The tournament rules are simply WRC rules, whereas the casual rules are the staff’s preferred mix of WRC, EMA and Tenhou rules.

For online play, Tenhou rules are used by nature of playing on Tenhou.

A list of terms can be found below.

Show notes

Rule	Casual	Tournament	Source (casual)	Notes
Kuitan	Ari		WRC, Tenhou	Open tanyao is allowed.
Atozuke	Ari		WRC, Tenhou	The hand does not need to contain a yaku before the winning tile is claimed.
Starting	25,000	30,000	Tenhou	Players start the game with this many points.
Goal	30,000		WRC, Tenhou	At least one player must have at least this many points for the game to end normally (i.e. not reach an extra round).
Oka	0		WRC	There is no bonus for being in first place.
Uma	15/5/-5/-15		WRC	After dividing the scores by 1000, this is the amount to add for each player.
Akadora	One of each (as available)	Nashi	WRC (mod), Tenhou	Whether red fives are used. Red fives are worth one extra dora each.
Calling precedence	Ron→first		WRC	Ron precedes all calls. If no ron, then the first call has precedence. If calls are done simultaneously, pon/kan have priority over chii.
Kuikae	Nashi		WRC, Tenhou	Swap calling is not allowed. Swap calling is discarding the same tile that was called, or the opposite side of a ryanmen wait.
Minimum points to riichi	1000	N/A	WRC (mod), Tenhou	The minimum number of points to legally call riichi.
Enchousen	Ari	N/A	Tenhou	Ari If no player has reached the goal score, the game goes into the next round (West for a hanchan and South for a tonpuusen). Play continues until the end of the round is reached, or the dealer is in the lead and above the goal score if a renchan would normally occur, or a player has met the goal score and a renchan would not normally occur. Enchousen lasts for only one round.
Abortive draws	Nashi		WRC	There are no abortive draws, including suucha riichi, suufon renda, suukaikan, kyuushuu kyuuhai, and sanchahou.
Tobi	Ari	Nashi	WRC (mod), Tenhou	Ari The game ends when a player has less than 0 points. Nashi The game continues even if a player has less than 0 points.
Agariyame	Ari	Nashi	Tenhou	Ari A dealer in the lead who has met the goal at oorasu may choose to end the game immediately instead of continuing a renchan. Nashi A dealer renchan cannot be terminated early.
Double ron	Ari	Atamahane	Tenhou	Ari When two players call ron on the same discard, both players receive payment. Atamahane Only the player closest to the discarder in turn order wins the hand and receives payment.
Triple ron	Ari	Atamahane	EMA	Ari When three players call ron on the same discard, all three players get paid. Atamahane The player closest to the discarder in turn order wins the hand.
Renchan	Winning hand, dealer tenpai		WRC, Tenhou	The dealer keeps their dealership and a honba is added when they win a hand, when they are in tenpai at an exhaustive draw, or when there is an abortive draw (if applicable).
Noten riichi	Nashi		WRC, Tenhou	Calling riichi without being in tenpai is not allowed and will be penalized with chombo at ryuukyoku.
Ryanhan shibari	Nashi		WRC, Tenhou	Hands still only need a minimum of one han to win with five or more honba on the table.
Daiminkan, shouminkan kandora	Immediately		WRC	When an open kan or added kan is called, the kandora is flipped immediately after the call.
Ankan kandora	Immediately		WRC, Tenhou	When a closed kan is called, the kandora is flipped immediately after the call.
Furiten riichi	Ari		WRC, Tenhou	Declaring riichi while in furiten is allowed.
Nagashi mangan	Ari, winning hand, closed only	Nashi	WRC (mod)	Ari, winning hand, closed only A nagashi mangan is treated as a winning hand at ryuukyoku. The hand must be closed (i.e. the player must not have claimed any tiles). Nashi Nagashi mangan is not a win, nor is it treated specially at ryuukyoku.
Renhou	Ari, mangan		WRC	A player declaring ron before their first draw is awarded a mangan or the value of the hand, whichever is greater. No tiles may have been called by any other player prior to the ron.
Kokushi ankan chankan	Ari	Nashi	EMA	A player may call ron on a closed kan if it completes a kokushi musou.
Daisharin	Nashi		WRC, Tenhou	A closed hand comprised of pairs from 2-8 in one suit is not scored as yakuman by itself.
Ryuuiisou	Hatsu not required		WRC, Tenhou	When going for ryuuiisou ("all green"), hatsu (green dragon) is not required in the hand.
Paarenchan	Nashi		WRC, Tenhou	Hands won with 8 honba on the table are scored normally.
Open riichi	Nashi		WRC, Tenhou	Players cannot reveal waits when calling riichi.
Kan on riichi	Ari, doesn't change interpretation or waits		WRC	A kan may be called after calling riichi only if doing so does not change the waits or the interpretation of the hand.
Pinfu tsumo	20 fu		WRC, Tenhou	The 2 fu for tsumo are waived when pinfu tsumo is scored.
Chiitoi	2 han, 25 fu		WRC, Tenhou	The value of chiitoi is 2 han. The hand is always scored as 25 fu.
Double wind pair	4 fu	2 fu	Tenhou	The number of fu scored by a pair of winds that is both the round wind and the player's seat wind.
Rinshan tsumo	2 fu		WRC, Tenhou	The 2 fu for tsumo still applies when winning by rinshan.
Pao	Daisangen, Daisuushi	Daisangen, Daisuushi, Suukantsu	Tenhou	The discarder of a third dragon or fourth wind when another player has already visibly claimed the two or three other sets is liable to pay the value of the whole hand if the hand wins by tsumo, or half its value if won by ron. For tournament play, the discarder is also liable to pay when discarding a tile that is claimed as another player's fourth kan (suukantsu pao). No liability is incurred for discarding a tile that leads to a rinshan (rinshan pao).
Double yakuman	Nashi		WRC, Tenhou	A single yakuman is never worth double its value. This includes daisuushi and the pure wait forms of kokushi musou and chuuren poutou.
Yakuman stacking	Ari		WRC, Tenhou	If a hand is composed of multiple yakuman, the value of each yakuman is counted.
Kazoe yakuman	Ari	Nashi	Tenhou	Ari A hand worth 13+ han is scored as a yakuman. Nashi A hand worth 13+ han is scored as a sanbaiman.
Kiriage mangan	Nashi	Ari	Tenhou	Ari A hand worth 3 han 60 fu or 4 han 30 fu is scored as a mangan. Nashi A hand worth 3 han 60 fu or 4 han 30 fu is scored normally and not rounded to a mangan.
Pao bonus sticks	Discarder		WRC	If a win involves pao, the bonus sticks are paid by the discarder.
Double/triple ron bonus sticks	Atamahane	N/A	Tenhou	Atamahane For multiple ron, the bonus sticks are given to the winner that is closest to the discarder in turn order.
Uma in case of tie	Split/Divide		WRC	Multiple players with the same score at the end of the game will split the uma evenly between them.
Remaining riichi bets	Lost		WRC	Any riichi bets left after the final hand are lost.

Glossary

Other terms can be found in the Riichi Wiki.

Ari

"On"

EMA

European Mahjong Association

Nashi

"Off"

Tenhou

Tenhou.net

WRC

World Riichi Championship

WRC (mod)

World Riichi Championship, optional rules for casual play