This page is for people who are familiar with mahjong, but don't know
which rules exactly the McGill Students' Mahjong Club play with. Here
are the subtle variations we use in our Japanese Riichi mahjong games that
other players may or may not be familiar with. Note that none of these
apply to our classic Hong Kong Old Style mahjong games. For more experienced players, an exhaustive list using the more common Japanese terms for these rules is below.
- We use the 'agariyame' rule: If the dealer wins during the fourth hand of the south round, is in first place, and has 30,000 or more points, he can call an end to the game immediately without needing the winds to shift.
- We do not allow two players to win off of the same discard. Whoever is closest to the discarding player in turn order takes the win.
- Players may declare riichi while in furiten.
- The one yaku minimum is always enough to declare a win. No matter how often the dealer wins, there is never a two han minumum.
- You may declare a win with any legal yaku, even if that yaku is not inherently a part of the hand (Such as a hand that is waiting on a pair of green dragon for the win or a pair of 1-dots for a yakuless win).
- If a player discards a tile that you can declare a win off of but you do not, you are forbidden from declaring any wins off of discarded tiles until you draw another tile. Even if a player makes an open meld to change the turn order, you must draw a tile to leave the temporary furiten.
- We allow open All Simples hands.
- You may not call a pon and immediately discard the fourth copy of that tile. It is also forbidden to call a chii and discard an identical copy of the tile you melded, or a tile from the other side of the chii. For example, if a player discards a 5-bamboo and you create an open chii of 3-4-5 bamboo, you may not discard a 5-bamboo or a 2-bamboo (as it could make a 2-3-4 bamboo chi) in the same turn.
- A false declaration of win is penalized by paying a low-limit worth of points to all other players (2000 points to non-dealers, 4000 points to the dealer, or by paying 4000 points to all other players if you are the dealer). This can occur if your hand does not have any yaku, or if your hand is not a valid win (it does not create four melds and a pair, seven distinct pairs, or the Thirteen Orphans hand).
- Some hands are inherently worth double limits (Big Four Winds, Big Seven Stars, Pair Wait on Four Concealed Pons, 13-Way Thirteen Orphans, Pure Nine Gates).
- We treat Gift of Man, Eight Dealer Keeps, and The Chariot as limit hands.
- We allow counted limit hands (kazoe yakuman) and multiple limit hands (such as a Little Four Winds All Honors).
- We do NOT treat Four Chained Pons, Three Chained Pons, Four Chained Chiis, Three Chained Chiis, Thirteen Disconnected Tiles, or Open Riichi as valid yaku.
- The responsibility rule is in effect for the following limit hands: Big Four Winds, Big Three Dragons, All Honors, All Terminals, Perfect Green, Four Kans. In addition, if a play makes an open kan off of another player's discard and completes his hand with the replacement tile, the hand is treated as a win by discard off of that player. It includes the Win Off a Kan Replacement yaku, but does not include the 2 fu for self-pick.
- We play with red 5's in sets that include them.
- We use kan dora indicators and under dora indicators (ura dora).
- An abortive draw occurs when:
- A player chooses to reveal her opening hands of at least nine different orphan tiles on her first turn, before any open melds or concealed kans are made.
- All four players discard the same wind tile on their first turn, without any concealed kan being made.
- Four kans are made by more than one player, or after one player makes four kans, a fifth player declares a legal fifth kan (This fifth kan cannot be robbed and no replacement tile is drawn, the game ends immediately).
- After three players declare riichi in one hand, the fourth player legally declares riichi and her discard is not used for a win (All players then immediately reveal their hands to prove that their riichi declarations were legal).
- Three players try to declare a win off of the same discarded tile (All players then immediately reveal their hands to prove that their declarations for the win were legal).
- A concealed kan can only be robbed for a Thirteen Orphans hand.
- Agariyame ari
- Red dora: Depends on whether the set we use has them, generally used.
- Kan/ura/kan ura dora ari
- Double ron nashi (Atama-hane ari)
- Furiten riichi ari
- Ryanhan shibari nashi
- Atodzuke ari
- Kuitan ari
- Pinfu tsumo ari
- Renhou, paarenchan, daisharin yakuman
- Kazoe yakuman ari, double yakuman ari
- Seikinin barai ari (Daisangen, daisuushi, tsuuiisou, ryuuiisou, chinroutou, sankantsu, daiminkan rinshan kaihou)
- Kuikae nashi
- Karaten ari
- Rinshan kaihou always opens a new kan dora indicator
- Shouminkan opens a kan dora indicator after the discard (except in a rinshan kaihou)
- Chankan never opens a new kan dora indicator
- Tochuu ryuukyoku ari (Kyuushuu kyuuhai, suufon renta, suucha riichi, suukaikan, sanchahou)
- Kokushi ankan chankan ari
- Kiriage mangan ari
- Nagashi mangan ari
- Iishoku sanjun, iishoku yonjun, sanrenkou, suurenkou, shiisanpuuta, open riichi nashi
- Double wind pair are worth 4 fu
- Oka 30,000 points, Uma +10/+5/-5/-10
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