I've compiled all the articles I've written so far with the aim of improving my mahjong skills.
This blog focuses on the trial and error process of climbing the ranks in Tenhou and Janryu, analysis of performance data, and recommendations for strategy books and mental approaches.
While the technical aspects are still under development, please feel free to use any parts that you find useful.

Tenhou/Jantama related content (Newer content at the bottom)
This section focuses on records of rank promotions and demotions, as well as analysis of performance data.
How to get better at Mahjong: Introduction (for beginners)
The point is that Tenhou is a useful tool for improving your mahjong skills.
Should I play East-South games or East-only games in Tenhou (Mahjong)?
This is a topic that might divide opinions, but I've written down my own thoughts.
Things that helped me go from 4th dan to 6th dan in Tenhou (Mahjong) (including recommendations for strategy books)
This is a story about how, after hitting a wall at the 4th dan level, I was able to get promoted through trial and error.
Finally promoted to 6th dan in Tenhou (Mahjong) - A rough analysis of my current performance.
I'm currently analyzing my performance while competing at the 6th dan level.
I was demoted from 6th dan to 5th dan in Tenhou (Mahjong), so I'm comparing my performance analysis results with those of the Tenhou champion.
This is a story about how, after experiencing relegation for the first time, I was shocked but also thought about what I needed to do.
Re-promoted from 5th to 6th dan in Tenhou (Mahjong): Comparison and analysis of areas where improvements were made.
I was surprisingly promoted back to the next rank, so I was relieved in many ways.
Trial and error at Tenhou (Mahjong) 6th dan: The importance of avoiding last place.
It seems there's a wall at the 6th dan level, and they're trying various things through trial and error.
I'm currently struggling at Tenhou (Mahjong), rank 6, and learning from others.
I'm still unable to overcome the 6-step barrier, so I'm trying to escape reality by changing my perspective a bit.
Tenhou (Mahjong): Promoted to 6th dan for the third time. Using the number of successful sequences as a basis for deciding whether to push or fold.
This is a kind of update on my current situation, saying that I feel like I'm growing with each promotion.
I was promoted to 7th dan in Tenhou (Mahjong) for the first time. I'll share what helped me overcome the hurdle of 6th dan.
Having finally broken through the 6-dan barrier and reached the 7th dan, I'd like to share some helpful books and strategies.
My impressions after playing the online mahjong game "Jantama" until I reached the rank of Mahjong Master.
This post is about my experience playing "Jantama," another online mahjong game besides Tenhou, as a change of pace.
Most of the discussion revolves around comparisons with Tenhou.
Mahjong Soul (Jantama): An analysis of my own performance and my current strategy in the King's Room.
Since my playing style in the "Jade Room" of Mahjong Soul has become more consistent, I'm summarizing my results and playing style here.
How to Use the "Shanhan" Tile History Tool | From Understanding Rank Stability and Performance to What to Do When Tiles "Don't Come Up"
「雀魂牌譜屋」の使い方から、安定段位の理屈、対戦相手の成績の調べ方、名前で検索しても出てこない時の対処法までまとめています。
Mahjong Soul: Things I keep in mind to reduce my last-place rate
Having been promoted to Mahjong Saint rank 2, I've put together a summary of things I've been paying attention to recently.
Mahjong Soul: How to progress from Mahjong Saint 2 to Mahjong Saint 3
I was promoted to Mahjong Saint 3 fairly quickly, so I'm writing about the playing techniques that I found effective.
How to improve your performance in online mahjong game, Jan Soul.
This section describes methods for improvement based on each performance criterion.
We also introduce some tactical books.
An analysis of when you feel you're having bad luck in Mahjong Soul: The Riichi Edition (Mahjong Soul Ticket Record Shop)
When you feel like you're having an unusually bad day, it's important to check the data to calm yourself down.
How to Use and Interpret the Mahjong AI "Mortal" | Bad Move Rates and Rating Guidelines, the Difference Between 4.1 and 4.0, and How to Choose Between It and the Official MAKA in "Jantam" (Jantam and Tenhou)
無料で使える麻雀AI「Mortal」の使い方、悪手率・レーティングの目安、雀魂公式AI「MAKA」との使い分けまで紹介しています。
How to Analyze Mahjong Hand Records | What to Look For and How to Apply It to Your Play (Jankon, Tenho)
麻雀AIで牌譜検討をするときに、どの局を見て、見つけたことをどう打ち方に変えるか、という手順をまとめています。
Mahjong Soul (Jantama): Points where I changed my playing style since last year and improved my performance.
This section highlights aspects of the changes made since the previous year that appear to be working well.
technical theory
How to improve your mahjong skills: Push/fold decisions (for beginners)
This guide is written for beginners, starting with the basics of what pushing and pulling mean.
How to become a better mahjong player: The art of defending (for beginners)
This article is written for beginners and explains the importance of knowing when to fold.
How to improve your Mahjong skills: Calling techniques (for beginners)
This article is written for beginners, starting with the benefits of bird calls.
Is it a bad-shaped, high-scoring tenpai, or a good-shaped, low-scoring tenpai?
I wrote this with a degree of skepticism, as it contradicts my own feelings.
To get better at mahjong, try thinking about new theories.
This is a story about how I realized how much the theory has changed after studying modern mahjong while playing Tenhou. (Warning: The content I'm writing is outdated and embarrassing.)
psychology
To become a better mahjong player, you need to control your mental game.
I'm writing this almost as if I'm trying to convince myself.
Words to help you stay calm after getting last place in a row in Tenhou
I wrote this again for myself, since I get easily irritated.
Are you okay? A summary of the behaviors of people who are bad at mahjong (mainly regarding manners)
This is basically a rant about my experiences playing mahjong in real life.
Use the "Mahjong Soul Rank Match Point Progression Graph Creation Tool" to stabilize your mental state.
The idea is to graph the point changes to understand how often upward and downward fluctuations occur, thereby preventing mental deterioration.
Tactics book
This one book is all you need! Recommended Mahjong Strategy Book: 301 Essential "What to Discard" Situations (Author: G. Uzaku, Editor: Makoto Fukuchi)
This book is incredibly helpful for improving your skills.
Mahjong strategy book "Statistics" Mahjong strategy (Author: Miinin)
While it may not provide immediate results in improving your skills, it's a good book for bridging the gap between your own impressions and perceptions and reality.
Mahjong strategy book "Mahjong AI Tactics: Winning Strategies as Told by the Artificial Intelligence 'Bakuda'" (by Naoki Mizukami)
While some questions remain, there were some surprising conclusions, making it an intriguing read for future developments.
Mahjong strategy book "Mahjong Winning Techniques: Calling Techniques" (by Akihiro Kawamura)
You can learn the thrilling tactics of a competitive mahjong player, as well as insider tips and tricks that are useful in real mahjong.
Mahjong strategy book "Uzaku-style Mahjong Learning: Tile Efficiency" (Author: G. Uzaku)
This book is a reference guide that summarizes the theory of tile efficiency presented in G. Uzak's "What to Discard."
Mahjong strategy book "Become stronger just by knowing: Mahjong's two choices" (by Miinin and Takunori Kajimoto)
This book is well worth reading, as it provides clear, quantitative answers based on data-driven evidence.
Mahjong strategy book "The Mahjong Mechanism of the Master Mahjong Player" (Author: Naoki Takiguchi)
This is a strategy book that systematically explains the important skills you should acquire to reach the top.
Introduction and review of the mahjong strategy book "Mahjong Winning System" (author: Takahiro Yamakoshi)
This tactics book prioritizes clarity and ease of implementation, with one strategy per page.
Introduction and review of the mahjong strategy book "New Scientific Mahjong" (author: Totsugeki Tohoku)
This is a very useful reference book for checking your answers later on in situations where you were unsure of your decision.
Since it's difficult to put everything into practice, it's helpful to start by mastering the areas you struggle with.
Introduction and review of the mahjong strategy book "The Ironclad Tactics of Mahjong AI 'NAGA'" (Author: Shogo Takita)
This book analyzes the decisions made by the mahjong AI "NAGA," extracts effective strategies, and compiles them in an easy-to-use format.
It breaks down AI decisions that might contradict intuition into easily understandable terms.
others
A recommendation for managing your real-life mahjong results in Excel.
This is the score sheet we use to manage the results of our company's mahjong games.
Considering the differences in mindset between those who play real-life mahjong and those who play online mahjong.
This post is about my experiences playing mahjong with colleagues who have no experience with online mahjong.
If you're around 5th or 6th dan in Tenhou (an online mahjong game), you're considered one of the strongest players in the company.
This article was written to comfort myself, as I can't seem to get past the 6-step barrier.
Other ②
Introduction and review of the mahjong strategy book "Mahjong: A Strong Player's Choice That Changes Depending on the Score Situation" (Author: Genki Hirasawa)
This is an introduction to a strategy book that summarizes the perspective that you should change your playing style depending on the score situation.
For Those Who Always Finish 2nd or 3rd in Mahjong | Understanding Average Rankings and Why You Can’t Seem to Win
ラスは少ないのに2位・3位ばかりで終わってしまう人向けに、順位分布の形と平均順位の目安、勝ち切れない理由を整理した記事です。
Maintaining motivation by checking the fluctuations in your performance in Tenhou (Mahjong): good and bad periods.
This article visualizes the ups and downs of performance and discusses strategies for maintaining mental well-being.
What is the strongest free mahjong software?
This article is about searching for free mahjong software that can be used as an alternative to playing against other people.
Let's compare the elements of mahjong and baseball and consider their commonalities.
I tried to think about the commonalities between mahjong and baseball, two seemingly unrelated sports.
Play against a mahjong beginner to learn their offensive style.
This article explores whether there's anything we can learn from the aggressive approach of a mahjong beginner.
Going from 5th to 6th Dan in Tenhou (Mahjong): Strategies from the initial hand, based on a real game record.
I'm reviewing a game I played at the 6th dan level.
SaberMetrics for Mahjong, Too | I Had Claude Code Create a “Mahjong Version of OPS” Based on Data from the Tile Record Store
野球のOPSのような指標を麻雀にも作れないかと思い立ち、牌譜屋のデータを使ってClaude Codeに分析してもらった記事です。
Mahjong OPS Calculator | Enter your results from "Haihaya" to see your estimated ranking in "Tama no Ma"
上の記事で作った指標を、実際に自分の牌譜屋の成績を入れて計算できるツールです。