InjusticeJudge

Analyzes your Mahjong Soul, tenhou.net, or Riichi City game to find instances of mahjong injustice. Currently, it checks for:

• Your tenpai was chased with a worse wait and you deal into it
• You experience iishanten hell (9+ draws)
• You start with 5+ shanten
• You lost points to someone's first-row ron or tsumo
• As dealer you lost points to a baiman+ tsumo
• Someone else had a bad wait ippatsu tsumo
• You just barely fail nagashi (due to the draw or a call)
• You deal into someone with your riichi tile (or tile that got you into tenpai)
• You draw a tile that would have completed a past tenpai wait
• You dealt in with what would have been the final discard of the round, while tenpai
• You dealt into any of: dama, ippatsu, houtei, double/triple ron, ura 3, or closed dora 3
• Your iishanten haipai got reset due to an abortive draw
• You reached yakuman tenpai and did not win
• You got head bumped
• You were haneman+ tenpai but someone else won with a below-mangan hand
• You dropped placement only because the winner got ura
• You had a (good) 4+ sided wait and didn't win
• You dealt into chankan while tenpai
• You had an early 8 outs ryanmen (or better) and never folded, but didn't win
• You keep drawing honor tiles that you discard immediately (6+ times)
• You draw and discard the same tile 6 times in a row (not in tenpai)
• You discarded dora and immediately drew dora after
• Your turn was skipped by pon/kan 3 or more times
• Your tenpai wait was damaged by someone calling ankan
• You are going for honitsu but drew 6+ off-suit tiles in a row
• You're still 4-shanten or worse after the first row of discards
• You had to deal with a triple riichi in which you are the one not in riichi (and you dealt in)
• You started with 3+ dora while 4th place, but then someone else won
• Your iishanten had 0 outs (at any point in time)
• You had no safe tiles after someone's riichi and drew at least 4 dangerous tiles afterwards
• Everyone immediately discarded a dangerous tile after your riichi
• You drew into tenpai but all the discards that give you tenpai will deal in
• You could have called chii into a 4+ han tenpai but were overridden by pon/kan
• At least half of your waits were in the dead wall
• You would have drawn your tile had the game continued for five more draws
• A riichi player would have dropped your tile had the game continued for five more draws
• A previous discard passed but the very next turn you discarded the same tile and it dealt in

Note: This program was explicitly written to

1. be funny
2. demonstrate how common some of these perceived injustices are.

What appears as an injustice to you may be well justified from another player's perspective!

Skills

Newest feature on the block is skill detection. Skills are instances of pure mahjong skill. Examples include:

• You started out with an iishanten hand
• You started out with 3+ dora
• You dealt 4 dangerous discards without dealing in
• Every tile you drew brought you closer to tenpai
• You called kan to get yourself 4 dora
• You called pon, pon, ron consecutively (or any two calls + win consecutively)
• You head bumped someone
• You won right after someone declared riichi, taking their riichi stick
• You won with a hell wait
• You changed wait and immediately won after
• Your very last draw brought you into tenpai (so you could get noten payments)
• You chased someone's tenpai and won with ippatsu
• You gained placement only because you had ura
• You won some silly yaku (ippatsu tsumo, rinshan, chankan, haitei, sankantsu, ryanpeikou, sanshoku doukou, double riichi, nagashi mangan)
• You got any yakuman (or sanbaiman)

Skills are pretty common. There's usually several in every game, and InjusticeJudge will recognize your skills for what they are.

Installation

You need a pipenv and python 3.10+

pipenv install

Usage (standalone)

Clone this repository, install requrements and run with either:

• python main.py -l '<log url>'
• python main.py -l '<log url>' -p <seat number 0-3>

where 0 = East, 1 = South, 2 = West, 3 = North.

Outputs injustices to console.

To output skills use -m skill:

• python main.py -l '<log url>' -m skill
• python main.py -l '<log url>' -p <seat number 0-3> -m skill

To output both skills and injustice use -m both:

• python main.py -l '<log url>' -m both
• python main.py -l '<log url>' -p <seat number 0-3> -m both

Usage (library)

import asyncio
from injustice_judge import analyze_game

# output injustices
asyncio.run(analyze_game("tenhou link")) # Use player from link
asyncio.run(analyze_game("tenhou link", {2})) # West player
asyncio.run(analyze_game("tenhou link", {0,1,2,3})) # All players

# output skills for each player
asyncio.run(analyze_game("tenhou link", look_for={"skill"})) # Use player from link
asyncio.run(analyze_game("tenhou link", {0,1,2,3}, look_for={"skill"})) # All players

# do both
asyncio.run(analyze_game("tenhou link", {0,1,2,3}, look_for={"injustice", "skill"}))

Setup for mahjong soul links

This is only required if you want to analyze mahjong soul logs. Create a config.env file and choose one option below:

Option 1: login to Chinese server with username and password

ms_username = "<your username>"
ms_password = "<your password>"

Option 2: login to EN server with uid and token

ms_uid = "<your uid>"
ms_token = "<your token>"

Both your UID (not friend code!) and token can be found by capturing the login request. To do this:

• Open up the Network tab in the developer tools of your browser and filter for XHR requests.
• Visit Mahjong Soul with the Network tab open.
• Once you see a request that says POST, click it.
• Check the request field, which should contain your UID and token: {"uid":"<your uid>","token":"<your token>","deviceId":"..."}

Setup for riichi city links

rc_sid = "<your sid>"

The sid can be found by capturing the cookies of any logged-in request. To do this:

• Download the desktop app for Riichi City and also Wireshark and mitmproxy.
• Setup mitmproxy:
  • Run SSLKEYLOGFILE=~/.mitmproxy/sslkeylogfile.txt mitmweb on command line
  • In your computer's network settings, set it to use 127.0.0.1:8080 as an HTTPS proxy
  • Visit http://mitm.it and install the certificate as instructed
• Setup Wireshark:
  • Launch Wireshark and go into the preferences
  • Under Protocols > TLS > (Pre)-Master-Secret log filename, enter the absolute path of $HOME/.mitmproxy/sslkeylogfile.txt (e.g. /Users/dani/.mitmproxy/sslkeylogfile.txt), then hit OK
  • In the main wireshark window, start capturing your network (it should be the first network in the list)
  • Apply the display filter _ws.col.protocol == "HTTP" && http.request.line matches "Cookies"
• Launch Riichi City and log in
• If all goes well, in Wireshark, you should see requests highlighted in green. Click any one of them, then on the bottom-left panel right-click the line that starts with Cookies (under Hypertext Transfer Protocol) and Copy > Value.
• This value should contain your sid.

Remember to close out of mitmweb and undo your proxy setting!