An awesome video guide from the internet. Common mistakes (2)

First of all, I want to show you a really good video guide that was created recently. The author is DdR_Dan, a player from US, who is staying consistently at 6d on tenhou, even got 7d in the past. Although it’s a little long, in my opinion it’s one of the best guides out there for 1-3 dan players, or even 4-5. Be sure to check out this and other videos on his Youtube channel too!


Common mistakes (2)


A lot of inexperienced player would feel that  is an isolated tile from the  sequence and therefore, discard it. That is a crucial mistake.

 should be interpreted as  + , which are two ryanmens, and the good discard here should be . After that, if you draw 4m/7m to convert 56m into a sequence, or 5m/8m to convert 67m into a sequence, you’d get tenpai with ryanmen wait!

The number of tiles that would turn   into one sequence and one ryanmen is 22 (four 4m, three 7m, three 5m, four 8m, four 4s, four 6s). Meanwhile the number of tiles that would turn  into one sequence and one ryanmen is only 12 (four 7p, four 4s, four 6s).


In this case,  and  should not be discarded. In the same fashion as the previous example,  should be interpreted as  + , two ryanmens. You can either discard 7m or 6s here (there’s a small difference between them but it should not be discussed here).

Players should remember  and  shapes. Discard the “leftover” tile from those shapes is usually a bad mistake. (more…)

Common mistakes (1), plus my introduction

Hey there, I’m starfire, a.k.a amaika on Some of you might have known me, some might not. I have played riichi since 2012. Now that I have become a decent player, 7d at the time posting this (even though I’m fully aware that I could drop back easily), and that the competitive part of the riichi community is not at a good state right now, I have decided to join the osamuko crew. My contents would definitely be not as good as xkime’s, but I hope that you readers can still find them useful! My posts will be written with the assumption that readers are familiar with the rules and common mahjong terms.

For my first post, I’d talk about some easily overlooked mistakes that are often committed by low-intermediate level players, including myself a lot of times.


 Tsumo: (Dora unrelated)

It is elementary mistake to discard  here.

New players only see pin tiles as  +  and  is leftover. However, in this case the pin tiles should be seen as  +  and  should be discarded, because your hand would now have Pinfu after 4p discard.

If you have something like , then the better discard choice would be , because you can’t have pinfu anyway, and two closed triplets give you more fu and the chance to kan. (more…)

Good Players Club 7th Grand Champion Cup

Today’s the day; it’s time for Good Player Club’s 7th Grand Champion Cup. We’ve mentioned last year’s iteration in this blog.

Our long-time friend Benjamin Boas is participating as part of the mahjong-loving association Good Player’s Club, home to other famous players like Akagi’s creator Nobuyuki Fukumoto, Obaka Miko’s artist and writer Masayuki Katayama, and other famous figures from not only the mahjong and manga world, but TV and media as well.


Professional Mahjong Commentary on Mondo in English!

MondoTV have uploaded 2 videos with English commentary by mahjong researcher Benjamin Boas and mahjong author Ryan Morris. Benjamin’s contribrutions to the community should be fairly well known to everyone, and Ryan’s less so. Ryan Morris is the author of the excellent but sadly now defunct “Japanese Mahjong for Dummies” guide, he has also wrote several articles in Japanese for Kindai Mahjong.

Please share, like and comment on the video to entice Mondo to create more content in English

Totori-sensei 19 years old wins the first season of Tenhoui vs Renmei

Photo from Ben and Deniz

This year JPML collaborated with Tenhou and hosted a 6 month long Tenhoui vs Renmei pro tournament. The first season used a Tenhou based ruleset with 50/20/0/70 uma, red fives, agari yame and tenpai yame.

Final Playoff Results
Rank Name Tenhoui # Total
1 Totorisensei 19sai 11 204.4
2 Naoki Setokuma N/A 127.6
3 Satoshi Fujisaki N/A 97.6
4 Doppo 3 86.9
5 Shuukatsusei@kawamuragundan 9 73.3
6 Hisato Sasaki N/A 60.5
7 Kanimajin 8 ▲21.6
8 Suzumekureijii 4 ▲83.2
9 Kenji Katsumata N/A ▲271.2
10 Naoya Maeda N/A ▲274.0

The 2nd season will start on the 23rd of December and will use JPML A rules. Yudai Maehara will replace Hisato Sasaki

Tentative Top 16 results from ERMC2016.

Hi there,

We saw a glitch occur on the ERMC website. We are publishing a table of the top 16 as we see them, with no claims on accuracy, quality, or perfection.

Henrik LETH
Sebastian LAVALLEE
Alexander SCHULER
Yixuan Liu
Philipp MARTIN

What a Bit of Game Theory Can Teach Us by Paul Lederer

Saw this post on the Chicago Mahjong Group and thought this would be of interest to some — Frenetic

Today I would like to talk about choices and options. Mahjong is a game, and like most games it has options for you to consider and choices that you as the player must make–choices like what to discard, or if you should call or if you should declare riichi.

Now I am not a very experienced Mahjong player, but I am a very experienced game player and what I have learned from basic game theory has let me pretend to know what I am doing in Mahjong to the point where I have people fooled that I’m actually good, and in most games there is one theme that prevails: the player with the most options is highly favored to win. Choices are also what separates a good player from a bad one, as good players make more good choices and bad players make more bad choices. Chess and Go are both zero sum games of open information, and in both games the goal is to remove all options from your opponent. Mahjong is not zero sum, and also it isn’t open information. There is also a decent amount of random chance involved. However, I feel that maximizing your options is key to every good Mahjong player’s strategy(interesting note: Two player zero sum games are more about removing your opponent’s options, while 4 player free for all games are more about maximizing your own options).


The Mahjong Meetup episode #7 broadcasts tomorrow

Tuesday, August 23rd, at 9:00 p.m. Pacific Daylight Time The Mahjong Meetup will return.

Dasuke will recap his mahjong travels in Japan. I’ll talk about running a live tile in person mahjong meetup and further refinements teaching riichi mahjong method.

M-san rejoins us from The Los Angeles Pride of Mahjong dojo.

Please join us!


IORMC Qualifiers (USA / Canada)

The North American Riichi Mahjong Association is looking for players to field teams for the 2016 Interational Online Riichi Mahjong Competition. The nations of the United States and Canada are each looking to assemble teams for the November competition. The competition is hosted via So familiarity with Tenhou’s interface is encouraged.

Registration Form:

To qualify, players must play in at least two out of the four scheduled competitions. Any players may enter in more than two of the schedule. Only the top two qualification scores are considered. So, there is no harm for any player to enter in more than two. US players compete in one set of qualifications, while Canadian players compete in their own set of qualifications. Both the US and Canadian competitions will occur concurrently.

A total of four players per nation will be selected with two alternates. Good luck to all participants.

The competition schedule is as follows:
* September 17
* October 1
* October 15
* October 29

The times for each tryout competition is still pending.

The 2016 Interational Online Riichi Mahjong Competition is the sixth international team competition hosted by the Korean Mahjong League (KML). With each iteration, the competition has been growing year after year. The previous year hosted 6 national teams. This year, at least, thirteen teams are slated to participate. For more information on the IORMC itself, see here:

The IORMC is scheduled for November 5 @ 11 AM UTC, which is 4 AM Pacific time or 7 AM Eastern time.

To anyone unfamiliar with the Tenhou interface, instructions may be found here:

On behalf of NARMA, we express our thanks to the Korean Mahjong League for hosting the IORMC.