Tenhou.net

Tenhou (天鳳, tenhou.net) is the one of the most popular online mahjong service in Japan. It is also the platform of choice for the English-speaking community.

Development history

• 2006/02/20 Hanjyukusou (半熟荘) beta released
• 2006/08/01 Came out of beta
• 2006/10/24 10,000 IDs registered
• 2007/01/20 Changed name to Tenhou
• 2007/12/25 100,000 IDs registered
• 2008/02/01 Windows client released
• 2009/02/20 Houou table opened
• 2010/08/22 1,000,000 IDs registered
• 2012/06/09 10,000 concurrent users
• 2013/07/10 2,500,000 IDs registered

Basic user's guide

Tenhou.net is a Japanese site. So, anyone, who is not familiar with navigating Japanense sites, may have some difficulty.

Tenhou.net house rules

• Rules of play

The site specifies a number of specific rules. While many general rules and procedures still apply, a number of rules for the game overall may be deemed as "optional"; and they may not apply elsewhere.

Four player

Table key
Kanji	English
位	Example
初期pt	Example
東風戦	Example
東南戦	Example
昇段pt	Example
在位数	Example
平均R	Example
1位	Example
2位	Example
3位	Example
4位	Example

位	初期pt	東風戦				東南戦				昇段pt	在位数	平均R
		1位	2位	3位	4位	1位	2位	3位	4位
Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
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Example	Example				Example				Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
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Example	Example				Example				Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example				Example				Example	Example	Example	Example
Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example	Example
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Example	Example										Example	Example

External links

• Comprehensive English documentation
• Tenhou manual
• Overall ranking tables
• Yaku frequency
• Official blog

Tools

• Tenhou ranking tool
• 天鳳牌譜解析