riichi-ts
v1.0.7
Published
Riichi mahjong calculations library
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Riichi Typescript library
Small library to calculate hands and yaku for japanese (riichi) mahjong.
Usage
Install the library using npm install riichi-ts
or yarn add riichi-ts
.
Type definitions for typescript are included in the package.
Tiles definition
Tiles are defined by a single integer number according to the following table:
- Man suit:
0
is 1man, ...8
is 9man - Pin suit:
9
is 1pin, ...17
is 9pin - Sou suit:
18
is 1sou, ...26
is 9sou - Honors:
- Winds:
27
is east, ...30
is north - Dragons:
31
is white,32
is green,33
is red
- Winds:
Usage:
import { Riichi } from 'riichi-ts';
const hand = new Riichi(
[10, 10, 10, 11, 11, 12, 12], // closed part of the hand. Taken tile from the wall should be the last here in case of tsumo.
[ // melds
{ open: true, tiles: [13, 14, 15] }, // set open: false to mark closed kan (ankan)
{ open: true, tiles: [15, 16, 17] },
],
{
bakaze: 27, // round wind
jikaze: 28 // seat wind
},
13, // tile taken from someone's discard. In case of tsumo, set this to null.
false, // was this the first take? Used to determine tenhou/chinou/renhou
true, // does this hand have riichi?
false, // does this hand have ippatsu?
false, // does this hand have daburu-riichi?
false, // is it the last taken tile? Used to determine haitei/houtei
false, // was it agari after a kan? Used to determine rinshan/chankan
0, // akadora count in hand
true, // allow akadora; if this is false, previous parameter is ignored
true, // allow kuitan?
false, // use kiriage mangan?
);
hand.disableDoubleyakuman(); // call this to count all yakumans as single
hand.disableYaku('yaku name'); // You can also disable some of the yaku
hand.disableHairi(); // Don't calculate improvements for the non-winning hand
const result = hand.calc();
/*
Result format:
{
error: false, // true if hand couldn't be parsed
fu: 30,
han: 6,
isAgari: true, // will be false if the hand is not winning
ten: 12000, // amount of points won by the hand
text: '', // additional info. Will contain 'no yaku' if the hand has no winning points
yaku: { // list of found yaku in the hand
chinitsu: 5, // yaku name and amount of han for certain yaku
tanyao: 1
},
yakuman: 0, // Count of yakumans found
hairi: { // shanten count and waits info
now: 0, // current shanten count. 0 for tenpai.
wait: [12], // tiles this hand is waiting for to improve or win
waitsAfterDiscard: { // waits after discarding a certain tile
12: [13, 14]
}
}
hairi7and13: { // same as above but only for chiitoitsu and kokushimusou.
now: 0,
wait: [12],
waitsAfterDiscard: { 12: [13, 14] }
}
}
*/
Full list of yaku names that can be detected:
- menzentsumo
- riichi
- ippatsu
- chankan
- rinshan
- haitei
- houtei
- pinfu
- tanyao
- iipeikou
- own wind east
- own wind south
- own wind west
- own wind north
- round wind east
- round wind south
- round wind west
- round wind north
- haku
- hatsu
- chun
- daburu riichi
- chiitoitsu
- chanta
- ittsu
- sanshoku
- sanshoku doukou
- sankantsu
- toitoi
- sanankou
- shosangen
- honroutou
- ryanpeikou
- junchan
- honitsu
- chinitsu
- renhou
- tenhou
- chihou
- daisangen
- suuankou
- suuankou tanki
- tsuuiisou
- ryuuiisou
- chinroutou
- chuurenpoto
- chuurenpoto 9 sides
- kokushimusou
- kokushimusou 13 sides
- daisuushi
- shosuushi
- suukantsu
- dora
- uradora
- akadora
Credits
Inspired by and partially taken from following repositories:
- https://github.com/takayama-lily/riichi
- https://github.com/takayama-lily/syanten
- https://github.com/takayama-lily/agari
Testing on real games data
The library was tested against millions of real-life game logs from Tenhou.net phoenix lobby. Though we don't supply these logs in the repo, you can still download it on Tenhou.net and use it for testing.
Please place zip archives with real replay logs into logs
folder. The testing script will traverse over all zip files there and will try to parse every replay file found.