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Riichi Mahjong

Japanese Mahjong, also known as Riichi Mahjong, focuses on strategy, logic, and precise calculations. It’s popular in Japan and worldwide. What makes it unique is its scoring system, with high-value hands like Yakuman, detailed point calculations, and special rules like Riichi and Dora, making the game both challenging and fun. ⛩️

Riichi Mahjong Tiles

Japanese Mahjong tiles include three suit types: Pin, Sou, and Man, as well as Winds and Dragons tiles: East, South, West, North, Red Dragon, Green Dragon, and White Dragon. A full set has 136 tiles, excluding the "Flowers" and "Seasons" tiles from Chinese Mahjong.

One special tile is the Red Dora, which includes the 5 Pin, 5 Sou, and 5 Man. Each Red Dora adds 1 extra Fan to the score. Players start with 13 tiles and aim to form specific combinations by drawing and discarding tiles to win. 🀄️

Riichi Mahjong Rules

The basic rules of Japanese Mahjong are similar to Chinese Mahjong, with the goal of completing a valid "winning hand." However, Japanese Mahjong focuses on Yaku, which are specific scoring conditions or patterns needed to win. Players must fulfill at least one Yaku to declare a win. In addition to Yaku, there are several unique rules, including:

  • Riichi: Once the conditions are met, players can declare Riichi, which increases the chances of winning and adds to the score.
  • Dora: Dora are bonus tiles randomly revealed during the game, which increase the score.
  • Draw: If no player wins during a round, or if certain special conditions occur, the round ends in a draw.

We have prepared a beginner's guide to Japanese Mahjong: Mahjong Tiles, Yaku, Yakuhai, All Simples, Riichi, Furiten, Dora. 🎲

2-Players Japanese Mahjong Rules

In 2-players Mahjong, the rules are modified from the standard four-player version as follows:

  • From the full set of 136 tiles, 80 tiles are randomly selected to form the draw pile, with the remaining 56 tiles set aside as spare.
  • After the game starts, players can choose between 0 to 13 tiles to exchange. The 56 spare tiles are then randomly drawn to replace the discarded tiles. The dealer can exchange up to 14 tiles, while the non-dealer can exchange up to 13 tiles.

Yaku List

Yaku is specific scoring conditions or patterns needed to win. in Japanese Mahjong, and understanding Yaku is crucial for winning in the game.

Japanese Mahjong Scoring Calculation

Fu Calculation

Fu is an important part of Mahjong scoring, reflecting the complexity of the hand. It is calculated based on various factors and then rounded to the nearest multiple of 10 for the final score.

Basic Points

The calculation formula for basic points is: Basic Points = Fu × 2^(Han + 2).

When the basic points exceed 2000, the following special rules apply:

  • Mangan: 5 Han, or 4 Han with basic points greater than 2000. The basic points are fixed at 2000.
  • Haneman: 6–7 Han, the basic points are 3000.
  • Baiman: 8–10 Han, the basic points are 4000.
  • Sanbaiman: 11–12 Han, the basic points are 6000.
  • Yakuman: 13 Han and above, the basic points are 8000.

When players are responsible for paying points, the points are calculated as follows (rounded up to the nearest 100 if below 100):

  • Non-dealer's self-drawn win: The dealer pays 2 times the basic points, while the other two non-dealers each pay the basic points.
  • Non-dealer's win by discard: The player who discarded the tile pays 4 times the basic points.
  • Dealer's self-drawn win: The other three players each pay 2 times the basic points.
  • Dealer's win by discard: The player who discarded the tile pays 6 times the basic points.

Scoring Quick Reference Table

Calculating basic points can be complex, so a quick reference table is used for easy lookup. Players just need to know the Fu and Fan of their winning hand to find the score, saving time on detailed calculations.

Non-Dealer Scoring Table: In each row, the first line shows the points collected for winning by discarding a tile, and the second line shows the points collected for self-drawn win from each non-dealer and the dealer.

Dealer Scoring Table: In each row, the first line shows the points collected for winning by discarding a tile, and the second line shows the points collected for self-drawn win from each non-dealer.

Japanese Mahjong Strategy Tips

A good Riichi Mahjong player typically possesses the following strategic and tactical skills:

  • Observe Dora: Dora are important tools for increasing your score. Effectively using Dora or limiting your opponents' access to Dora is crucial.
  • Master the Rhythm: Adjust your play style based on the situation—choose offense or defense depending on the risk. For example, play defensively when the game is risky to avoid giving your opponents easy wins.
  • Choose the Right Yaku: Learn the common Yaku (scoring patterns) and use them flexibly. This will not only increase your score but also speed up the process of winning.
  • Deduce Opponents’ Hands: By observing your opponents' discards and patterns, you can infer their hand and strategy, allowing you to adjust your own actions accordingly.
  • Strategic Riichi: While Riichi offers a chance for a higher score, it also exposes your hand. Be sure to use it at the right moment when the risk is worth it.

Why Play Riichi Mahjong Online in Mahjongo

Our version of the Riichi Mahjong game offers familiar rules, design and functionality. 🤗

Join hundreds of millions of Mahjong players around the world, train your memory and logic skills, meet new friends, and enjoy the interaction and communication between people. 👫🏽

Others

Language: Japanese • Simplified Chinese • Traditional Chinese

Tool: Riichi Mahjong Tile Generator • Riichi Mahjong Score Calculator

Special Thanks

dichohecho, D.Koehnen, Hilanderiam, Ken...

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