Questions tagged [riichi-mahjong]

Riichi Mahjong is a kind of Mahjong commonly played in Japan. It is famous for being suited to gambling and mahjong parlors.

Rīchi mahjong is the Japanese variant of the "set-building" game played with a standard set of tiles. While tiles are the primary medium, the game is available as online web services (net mahjong) or can be played with regular mahjong playing cards. It's a four player game that combines calculation and strategies that is found in competitive games like chess with the elements of observation skills, risk assessment, and luck.

While Rīchi mahjong shares many general principles with the other mahjong variants, it has very distinct rule variations, especially with scoring. It is the objective of each player to develop their hands to accumulate more points than any of the opponents. In combination with yaku and dora, the number of han and fu correlates to a specific number of points to determine the value of a hand, in the event of winning a hand.

Relevant links:

  • European Mahjong Association (Official; Information on rules, upcoming tournaments, tournament results and observer reports, player rankings and the rules in English)
  • UK Mahjong Association (Official; Information on Riichi open tournaments, affiliated clubs and other things)
  • tenhou.net (Japanese) (Free net mahjong, playing history, detailed statistics and replays, many active players regardless of time of day)
  • Japanese Mahjong Wiki (Encyclopedic information on rules, terminology, and strategies that anyone can contribute to)
  • Riichi Mahjong on Saki Wikia (Details and more information on the game)
  • Osamuko's Japanese Mahjong Blog (One of the most extensive online mahjong blogs in English)
  • ReachMahjong.com (Ran by professional players who wrote the Riichi Mahjong study book; you can find more WWYD problems and discussions, strategy guides, reports on tournaments and more)
  • Mahjong News (Updated regularly with information on upcoming mahjong tournaments (Riichi, MCR, and on- line), their results, newly released mahjong books, and more)
20 questions
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Why couldn't this hand win with ron?

I have just started learning Japanese Mahjong and I am a bit lost as to why this hand failed. I did several pons and chis over the course of a hand, having a total of three open melds (one set and two sequences). Apart from these I had an incomplete…
Mateusz Papiernik
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Why does an open pinfu get 2 extra fu added to the score?

In riichi mahjong, a concealed pinfu hand is worth 20-fu if it goes out on a tsumo. However, a hand with no points that has been opened gets a 2-fu bonus for no reason other than being an open pinfu. Even if the hand has another yaku to go out on…
goldPseudo
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Why to use Kuikae rule in Riichi Mahjong?

What is the reasoning beyond Kuikae (喰い替え) rule in riichi mahjong? What exactly are the situations that this rule prevents?
tadashi
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2
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What is preventing a win here

I'm playing Yakuza Kiwami 2 which has a Mahjong parlor to play in. I would have assumed the 5 I drew completed my hand. 2, 3, 4 of numbers triplets of 5 of numbers 6, 7, 8 of bamboo pair of 2 of stones what's the reason it didn't? I'm assuming it…
2
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Why is this NOT a winning hand

So I play Riichi-Mahjong as a mini game within a Playstation game called "Judgement". I've enjoyed it a lot and have read various guides online to try to improve my understanding and strategy of the game. However, I recently achieved the following…
PJW
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How to add red fives to a riichi set?

when using the rule for adding the three red fives in riichi mahjong, does one add the fives to the set, or do they replace fives already in the set with the red fives?
Cease
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0
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Question about furiten definition regarding winning tile in riichi mahjong

relatively new riichi mahjong player here. I haven't had this situation happen to myself before, but I'm curious about how the rules apply in this situation: Suppose I'm trying to go for tanyao (I know some rulesets don't allow tanyao in open hands…
0
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Why couldn't I win in this situation with ron?

I was playing riichi mahjong with the gamedesign.jp Flash game and just before my turn when I would draw the last tile I got into this situation: At last, it's mine! — I thought and clicked ron expecting to win the game as with the new 7 sou I…
Alicia
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