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	Tenhou rank	平均R	Avg R rating
初期pt	Base points	1位	Example
東風戦	East only	2位	Example
東南戦	Full hanchan	3位	Example
昇段pt	Target points	4位	Example
在位数	Player count	Rank based on Tenhou points

Four player

位	初期pt	東風戦				東南戦				昇段pt
		1位	2位	3位	4位	1位	2位	3位	4位
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Three 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	1位	2位	3位
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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