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Joined 3 March 2024
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Riichi Mahjong Primer
Riichi Mahjong Primer


This article will attempt to describe how to play riichi mahjong (Japanese Mahjong) online in a simple and concise way. Therefore, instructions to set up the game are omitted for this guide.
This article will attempt to describe how to play riichi mahjong (Japanese Mahjong) online in a simple and concise way. Therefore, any instructions related to setting up the game are omitted for this guide.


<div style="float:right; margin:0 0 1em 1em;">__TOC__</div>
<div style="float:right; margin:0 0 1em 1em;">__TOC__</div>
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==Tiles==
==Tiles==
There are 36 types of tiles, and 4 of each type, for a total of 136 tiles. They can be grouped into two major categories:
There are 36 types of tiles, and 4 of each type, for a total of 136 tiles. They can be grouped into two major categories:


'''Number Tiles'''. Each "suit" of numbered tile has tiles from 1-9. They can be used to form sequences, triplets, and pairs.
'''Number Tiles'''. Each "suit" of numbered tile has tiles from 1-9. They can be used to form sequences, triplets, and pairs.
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*A winning shape. With two exceptions, winning hands are comprised of 4 "[[#Sets|sets]]" + 1 "[[#Pairs|pair]]".
*A winning shape. With two exceptions, winning hands are comprised of 4 "[[#Sets|sets]]" + 1 "[[#Pairs|pair]]".
*A "[[yaku]]". Yaku are conditions that increase your hand's point value. '''In essence, a hand cannot win with 0 points, therefore a hand cannot win without any yaku'''.  
*A "[[yaku]]". Yaku are conditions or criteria that increase your hand's point value. '''In essence, a hand cannot win with 0 points, therefore a hand cannot win without any yaku'''. A yaku may rely on the tiles in the hand, or it may be based on how you win the hand.
**(Note: a hand may gain value via "[[dora]]" tiles, but if the hand has no value other than dora, it cannot win.)
**(Note: a hand may gain value via "[[dora]]" tiles, but if the hand has no value other than dora, it cannot win.)


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==Yaku==
==Yaku==
[[Yaku]] are specific criteria that gain you points. For example, [[toitoi|All Triplets]] requires all 4 sets to be triplets.To repeat, a hand cannot win with 0 points, therefore a hand ''must'' have at least 1 yaku.
{{Main|Yaku}}
 
[[Yaku]] are specific criteria that gain you points. For example, [[toitoi|All Triplets]] requires all 4 sets to be triplets. To repeat, a hand cannot win with 0 points, therefore a hand ''must'' have at least 1 yaku.


A hand can technically gain points with [[dora]] tiles. But if a hand has only dora tiles, and no yaku, it still can't win.
A hand can technically gain points with [[dora]] tiles. But if a hand has only dora tiles, and no yaku, it still can't win.
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After calling chii or pon, you discard a tile immediately, and it becomes the next player's turn. Therefore, when calling pon, you may skip other players' turns.
After calling chii or pon, you discard a tile immediately, and it becomes the next player's turn. Therefore, when calling pon, you may skip other players' turns.


After calling, you may not adjust the called set afterwards. So if you chii a 123 sequence, you may not change the sequence after drawing a 4. Also, because it reveals a part of the hand, other players may know the type/value of hand you are going for.
Calling comes with multiple downsides:
*After calling, you may not adjust the called set afterwards. So if you chii a 123 sequence, you may not change the sequence after drawing a 4.
*Calling reveals the set you completed. Other players may know the type and/or value of the hand once you call.
*Calling cheapens the hand, by preventing certain yaku, and reducing the value of other yaku. '''Therefore, when calling, you should have at least one yaku planned.'''


Usually, you are unable to "swap call" - you cannot discard a tile that would complete the set you just called. For example, if you had call 4-sou with a 23-sou semi-sequence, you cannot discard a 1. If you pon a 5-man, you cannot discard another 5-man.
Also, under most rules, you cannot "swap call" - you cannot discard a tile that would complete the set you just called. For example, if you had call 4-sou with a 23-sou semi-sequence, you cannot discard a 1. If you pon a 5-man, you cannot discard another 5-man.


===Kan===
===Kan===
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