Rules overview

Japanese mahjong is quite complex with its many rules and special cases. This article is a brief and quick layout to the most basic rules of the game, just to get new players started. For more detailed documentation on the rules, see Japanese mahjong, as well as other articles covering various game topics.

Tiles and suits

Main article: Mahjong equipment

Mahjong is played by four players
These tiles work similar to playing cards
All in all, there are 34 tile types
There are 4 copies each
In total, there are 136 tiles
The following are the three main suits, plus a class of "honor" tiles:

	36 tiles in the man suit
	36 tiles in the pin suit
	36 tiles in the sou suit
	28 honor tiles

Setup

Mahjong tiles at the initial setup before tiles are dealt.

After tiles are shuffled, the players build walls of face-down tiles
Each wall is 17 tiles long, double stacked
The four walls serve as a stockpile to draw tiles from
Each player starts with 25000 points
Point sticks are used to keep score, when playing with real tiles

Starting the deal

At the start of each hand after the walls are built, players are dealt 13 tiles each
One player throughout the game is designated as the dealer, marked by an indicator
The dealer is begins by rolling the dice, to determine the wall break

Seating positions

Main article: Jikaze

The dealer is always seated East
Player to the right of the dealer is South
Player across the dealer is West
Player to left of the dealer is North
Regular turn order: East, South, West, North
Per the turn order, each player gets 4 tiles per turn, until each has 12 tiles
Finish the deal process by drawing one tile each, for 13 tiles in the hand
Dealer always gets first draw and discard

Objective

Players take turns to draw and discard tiles to build complete hands (if possible)
Develop ready hands and hopefully complete them by draw or discard
Avoid playing into other player's hands, or else lose points

Ron: Players who win by tile discard scores points off the discarder
Tsumo: Players who win by tile draw scores points off of the other three players

Hands and yaku

Winning hands of 14 tiles contain four melds, plus a pair

Melds are specific groups of 3 tiles:
The pair consists of any two identical tiles
Melds and pairs cannot be of mixed suits

Two exceptions to this pattern: kokushi musou and Chii toitsu

A complete hand example:

Yaku

Main article: List of yaku

A winning hand must have at least one yaku (see the list for pattern examples)
A yaku is a condition or pattern of tiles that scores points. A hand cannot have 0 points, so a hand cannot win without yaku.
These patterns may be viewed like poker hands
Hands may have a combination of different yaku
Hand value is primarily based on your yaku patterns
Not all yaku are pattern-based, and it is not required to have a pattern-based yaku to win (e.g., you may win with riichi alone)

Strategy

Main article: strategy

A wide variety of strategies are employed, including:
- Knowing how to building hands quickly and/or efficiently
- Knowing how to avoid other player's hands
Memorizing the yaku, at least the common yaku, is important.
However, beginners should focus on being able to make winning hands at all. Riichi may be used for any hand that has not called chii or pon.

External links

Play sites

Tenhou.net

Popular Japanese-language site to play the game. Some English support is available with a browser extension.

Mahjong Soul

Another popular site with native English support. Features gacha game elements that are not relevant to mahjong gameplay.

Japanese Mahjong flash

Online version of the game against CPU players. No signup required. Japanese language.

Sources and guides