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	1位	First place points
初期pt	Base points	2位	Second place points
東風戦	East only	3位	Third place points
東南戦	Full hanchan	4位	Fourth place points
昇段pt	Target points	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
新人	0	一般 +30	一般 +0	+0	0	一般 +45	一般 +0	+0	0	30
9級	0				0				0	30
8級	0				0				0	30
7級	0				0				0	60
6級	0				0				0	60
5級	0				0				0	60
4級	0				0				0	90
3級	0				0				0	100
2級	-10				0				-15	100
1級	-20	Example	Example		Example	Example	Example		-30	100
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Three player

位	初期pt	東風戦			東南戦			昇段pt
		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