Resources

A collection of some Mahjong resources that I have seen. If you have any suggestions to add, let me know.

Rule Sets

European Mahjong Association's Rules for Japanese Mahjong (Riichi) 2025 (cached)
World Riichi Championship's Rules 2025 (cached)
World Mahjong Organization's Mahjong Competition Rules (cached)

Reference Sheets

/u/danma's Hong Kong Mahjong Cheat Sheet 1.0 (cached)
/u/Aranlyde's Riichi Mahjong Cheat Sheet (cached)
/u/Mr_Blarney's Common Waits (cached)
zessx's Riichi "Initiation" Cheatsheet (cached)
zessx's Riichi Scoring Cheatsheet (cached)
zessx's Riichi Yaku Cheatsheet (cached)
World Riichi Championship's Yaku List (cached)

Wikis

Texts

Daina Chiba's Riichi Book I (cached)
MrBlarney's Reading Multi-Sided Waits (cached)
buckwheat's Reading Complex Waits (cached)

Research

Mathematical aspect of the combinatorial game "Mahjong" by Cheng et al. (2017) (cached)
Let's Play Mahjong! by Li & Yan (2019) (cached)
Method for Constructing Artificial Intelligence Player with Abstraction to Markov Decision Processes in Multiplayer Game of Mahjong by Kurita & Hoki (2019) (cached)
Building a Computer Mahjong Player via Deep Convolutional Neural Networks by Gao et al. (2019) (cached)
Suphx: Mastering Mahjong with Deep Reinforcement Learning by Li et al. (2020) (cached)
A Fast Algorithm for Computing the Deficiency Number of a Mahjong Hand by Yan et al. (2021) (cached)
Building a 3-Player Mahjong AI using Deep Reinforcement Learning by Zhao & Holden (2022) (cached)
Evolutionary Optimization of Deep Learning Agents for Sparrow Mahjong by O'Connor et al. (2025) (cached)
Adapting Rules of Official International Mahjong for Online Players by Wang et al. (2026) (cached)

Blogs

Art

Public domain vector art for tiles (GitHub: FluffyStuff/riichi-mahjong-tiles)
LaTeX Typesetting for Mahjong tile groups (GitHub: Schmytzi/mahjong-tex)

Misc

Notes for Automatic Tables - Solor
randName()'s The Math of Mahjong