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

Saw this post on the Chicago Mahjong Group https://www.facebook.com/groups/chicagomahjong/ 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).

(more…)

Read More

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 Tenhou.net. So familiarity with Tenhou’s interface is encouraged.

Registration Form:
https://docs.google.com/forms/d/e/1FAIpQLSdXYylihLCNAHDOm8_UEqQwZ33Qw-Oeii3jqi62YSF1R46oGw/viewform?c=0&w=1

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:
http://kml.or.kr/xe/67895?ckattempt=1

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:
http://osamuko.com/complete-beginners-guide-to-online-mahjong-part-1-how-to-play/complete-beginners-guide-to-online-mahjong-part-1-5-playing-on-tenhou/

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

Read More

Osamuko OTP Tournament

The 23rd of July will the next instalment of tournaments by the osamuko discord be delivered and this time it’s an Open Pair Tournament. Where each game will be a battle between two teams in the form of a double elimination tournament for maximum excitement.

As we expect participants from all around the globe has two qualifications been decided. These will be in the form of danish swiss and will be between 3 and 6 rounds depending on the count of registrants. Registration is now open here and we need your registration before the 21th! For those who cannot find a teammate, feel free to seek us out in the #event channel on the discord.

PST UTC JST
Qualification 1 July 22nd 19:00 July 23rd 02:00 July 23nd 11:00
Qualification 2 July 23rd 03:00 July 23rd 10:00 July 23nd 19:00
Double Elimination July 23rd 16:00 July 23rd 23:00 July 24th 08:00

* Lobby C31949612 on tenhou
* Start and target score : 25,000
* Uma [5/5/5/-15]
* Aka ari, 1 red five in each suit
* Tobi ari, busting results in automatic loss for the team
* Agariyame/Tenpaiyame nashi, last dealer must continue their wind
* Shaaba nashi, no west round

EDIT: Uma has been updated.

Some updates;
The registration has been closed and the team list is as follows:

Qualification 1 [challonge], 3/6 will qualify:
* Tenhou doori no Kaidanjitachi; FKMTクレイジ, Hereford
* Osiris; わざα, bk201
* S’pore Cali Connection; DogBite, 241
* Nagoya; omasakun, 7
* Neptunia; Harmonix, unione
* Takoyaki; Nate., toast

Qualification 2 [challonge], 4/8 will qualify:
* Great Supine Protoplasmic Invertebrate Jellies; SCOTLAND, 二階堂夢乃
* Lion’s Ridge; 天下無双, Rinshan7
* Princess Debut; 原外桃, Jiemei
* NoticeMeTenpai; Tinecro, Guriido
* 双箭刻; LuckSack, MrFeng
* Irodorangers; 石壁, むいれうぇっど
* BlueHairBoys<3; KajzerJ, d(0.0;)b
* I know kan fu.; Skor, (/_;)

The best non-qualifying player from both qualification will be picked for last qualification slot.

Qualification has ended:

Tenhou doori no Kaidanjitachi Princess Debut
Neptunia NoticeMeTenpai
Takoyaki BlueHairBoys<3
双箭刻 I know kan fu.

  • 双箭刻 won the cross qualification with only a few more points than their main challenger S’pore Cali Connection

Challonge for the elimination round can be viewed here.

Read More

PML Riichi Mahjong Open 2016

The Pacific Mahjong League (PML) hosts the first international PML Riichi Mahjong Open 2016 tournament in San Francisco, California. Join us for an intense weekend of riichi with the pros and compete for one of NARMA’s spots in the World Riichi Championship!

Meet, greet and beat players from all over the world! The PML Riichi Mahjong Open has confirmed guests from all over the world, including top players from Japan and United States. US-based USPML (New York) and of course PML (California) will be in attendance! Limited space available – 48 slots for all tournament players including pros and invited special guests.

Full Event Details: http://pacificml.com/tournaments/riichi-mahjong-open-2016

Limited spots!  Registration Closes September 4th at 6pm Pacific!

WHEN
WHERE
San Francisco Int’l Airport Holiday Inn – 275 South Airport Boulevard, South San Francisco, CA 94080

World Riichi Championship Seat

Win the tournament and win one of the first available North American seats in the World Riichi Championship 2017.

3 Riichi Pros

Jenn Barr, JPML

Garthe Nelson, JPML

Benjamin Boas

12 Auto-Tables

Play on the brand new AMOS REXX fully automatic mahjong tables. 6 AMOS REXX and 6 Chinese automatic tables will be provided for players.

Read More

Osamuko Invitational

Hello there, next weekend will a few of us at osamuko discord arrange a team tournament because, well, yeah, way too few tournaments and leagues going on online right now. The format is 4 rounds of 4 games where the first three are an incomplete round robin and the final game is then paired by current position just like the IORMC.

The tournament is an invitational as we wanted to try and test how this works before eventually doing more tournaments later. There will be teams selected by classic captain picking before the tournament so yet we have no clue on how fair or unfair the teams will get. zawa zawa

  • 13:00 GMT 2nd of July 2016
  • 4 teams of 4 players
  • 4 hanchan rounds
  • Lobby C48833576 on tenhou
  • Start and target score : 30,000
  • Uma [30/10/0/-40]
  • Aka ari, 1 red five in each suit
  • Tobi nashi , no busting out
  • Agariyame/Tenpaiyame nashi, last dealer must continue their wind
  • Shaaba nashi, no west round

Oh, yeah, forgot to mention that we don’t have any planned streams but we do encourage anyone to join the lobby here, stream and commentate.

Some updates;
The playerlist is confirmed and the captains have made their picks.

  • Squid Squad; starfire, dynaman, ron⁵ and mou
  • Saturn癒し系高校; Iapetus, yazphier, xGeo and Niko
  • We don’t actually play this game; Dasuke, Mikoto, shinkii and fso
  • The Ladies’ Team; Jiemei, WhITelion, Kyuu and HondaMio

Tournament scores and bracket spreadsheet is prepared and can be viewed here.

Read More