.. image:: https://github.com/MahjongRepository/mahjong/workflows/Mahjong%20lib/badge.svg :target: https://github.com/MahjongRepository/mahjong

This document supports multiple languages: English <https://github.com/MahjongRepository/mahjong/blob/master/README.rst>_ | 简体中文 <https://github.com/MahjongRepository/mahjong/blob/master/README_CN.rst>_

Python 3.6+ is supported. If you need Python 2 support you can use v1.1.11 version of the library.

The library contains various tools (shanten, agari, hand calculation) for the Japanese version of mahjong (riichi mahjong).

Riichi mahjong hands calculation

This library can calculate hand cost (han, fu with details, yaku, and scores) for riichi mahjong (Japanese version).

It supports optional features like:

========================================================================================== ========================= =========================== Feature Keyword parameter Default value ========================================================================================== ========================= =========================== Disable or enable open tanyao yaku has_open_tanyao False

Disable or enable aka dora in the hand has_aka_dora False

Disable or enable double yakuman (like suuanko tanki) has_double_yakuman True

Settings for different kazoe yakuman calculation (it сan be an yakuman or a sanbaiman) kazoe_limit HandConstants.KAZOE_LIMITED

Support kiriage mangan kiriage False

Allow to disable additional +2 fu in open hand (you can make 1-20 hand with that setting) fu_for_open_pinfu True

Disable or enable pinfu tsumo fu_for_pinfu_tsumo False

Counting renhou as 5 han or yakuman renhou_as_yakuman False

Disable or enable Daisharin yakuman has_daisharin False

Disable or enable Daisharin in other suits (Daisuurin, Daichikurin) has_daisharin_other_suits False

Disable or enable yakuman for dealing into open hands has_sashikomi_yakuman False

Limit yakuman calculation to 6 (maximum score 192000) limit_to_sextuple_yakuman True

Disable or enable extra yakuman for all honors 7 pairs has_daichisei False

Disable or enable paarenchan without any yaku paarenchan_needs_yaku True ========================================================================================== ========================= ===========================

The code was validated on tenhou.net phoenix replays in total on 11,120,125 hands.

So, we can say that our hand calculator works the same way that tenhou.net hand calculation.

Project repository: https://github.com/MahjongRepository/mahjong

How to install

::

pip install mahjong

How to use

You can find more examples here: https://github.com/MahjongRepository/mahjong/blob/master/doc/examples.py

Let's calculate how much will cost this hand:

.. image:: https://user-images.githubusercontent.com/475367/30796350-3d30431a-a204-11e7-99e5-aab144c82f97.png

Tanyao hand by ron ^^^^^^^^^^^^^^^^^^

.. code-block:: python

from mahjong.hand_calculating.hand import HandCalculator
from mahjong.tile import TilesConverter
from mahjong.hand_calculating.hand_config import HandConfig
from mahjong.meld import Meld

calculator = HandCalculator()

# we had to use all 14 tiles in that array
tiles = TilesConverter.string_to_136_array(man='22444', pin='333567', sou='444')
win_tile = TilesConverter.string_to_136_array(sou='4')[0]

result = calculator.estimate_hand_value(tiles, win_tile)

print(result.han, result.fu)
print(result.cost['main'])
print(result.yaku)
for fu_item in result.fu_details:
    print(fu_item)

Output:

::

1 40
1300
[Tanyao]
{'fu': 30, 'reason': 'base'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 2, 'reason': 'open_pon'}

How about tsumo? ^^^^^^^^^^^^^^^^

.. code-block:: python

result = calculator.estimate_hand_value(tiles, win_tile, config=HandConfig(is_tsumo=True))

print(result.han, result.fu)
print(result.cost['main'], result.cost['additional'])
print(result.yaku)
for fu_item in result.fu_details:
    print(fu_item)

Output:

::

4 40
4000 2000
[Menzen Tsumo, Tanyao, San Ankou]
{'fu': 20, 'reason': 'base'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 2, 'reason': 'tsumo'}

What if we add open set? ^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: python

melds = [Meld(meld_type=Meld.PON, tiles=TilesConverter.string_to_136_array(man='444'))]

result = calculator.estimate_hand_value(tiles, win_tile, melds=melds, config=HandConfig(options=OptionalRules(has_open_tanyao=True)))

print(result.han, result.fu)
print(result.cost['main'])
print(result.yaku)
for fu_item in result.fu_details:
    print(fu_item)

Output:

::

1 30
1000
[Tanyao]
{'fu': 20, 'reason': 'base'}
{'fu': 4, 'reason': 'closed_pon'}
{'fu': 2, 'reason': 'open_pon'}
{'fu': 2, 'reason': 'open_pon'}

Shanten calculation

.. code-block:: python

from mahjong.shanten import Shanten

shanten = Shanten()
tiles = TilesConverter.string_to_34_array(man='13569', pin='123459', sou='443')
result = shanten.calculate_shanten(tiles)

print(result)

Aotenjou scoring rules

.. code-block:: python

tiles = self.TilesConverter.string_to_136_array(honors='11133555666777')
win_tile = self.TilesConverter.string_to_136_array(honors='3')[0]

melds = [
    Meld(meld_type=Meld.KAN, tiles=TilesConverter.string_to_136_array(honors='1111'), opened=False),
    Meld(meld_type=Meld.KAN, tiles=TilesConverter.string_to_136_array(honors='5555'), opened=False),
    Meld(meld_type=Meld.KAN, tiles=TilesConverter.string_to_136_array(honors='6666'), opened=False),
    Meld(meld_type=Meld.KAN, tiles=TilesConverter.string_to_136_array(honors='7777'), opened=False),
]

result = hand.estimate_hand_value(tiles, win_tile, melds=melds, dora_indicators=TilesConverter.string_to_136_array(honors='44447777'),
    scores_calculator_factory=Aotenjou, config=HandConfig(is_riichi=True, is_tsumo=True, is_ippatsu=True, is_haitei=True, player_wind=EAST, round_wind=EAST))

print(result.han, result.fu)
print(result.cost['main'])
print(result.yaku)
for fu_item in result.fu_details:
    print(fu_item)

Output:

::

95 160
50706024009129176059868128215100
[Menzen Tsumo, Riichi, Ippatsu, Haitei Raoyue, Yakuhai (wind of place), Yakuhai (wind of round), Daisangen, Suu kantsu, Tsuu iisou, Suu ankou tanki, Dora 24]
{'fu': 32, 'reason': 'closed_terminal_kan'}
{'fu': 32, 'reason': 'closed_terminal_kan'}
{'fu': 32, 'reason': 'closed_terminal_kan'}
{'fu': 32, 'reason': 'closed_terminal_kan'}
{'fu': 20, 'reason': 'base'}
{'fu': 2, 'reason': 'pair_wait'}
{'fu': 2, 'reason': 'tsumo'}