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.

Ranking system

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

Four player

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
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External links

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

Tools

• Tenhou ranking tool
• 天鳳牌譜解析