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.

Game lobby

Game interface

During the game, most of the clickable options are near the bottom of the screen. The rest is dedicated towards other players' hands (unrevealed of course) and the discard piles in the center. Also in the center, a square display shows players' point standings, names, and rank. In addition, the current wind round is indicated in the center square as well as the number of honba as well as the number of riichi points on the table.

Individual player statistics

Players with registered IDs have various statistics tracked by Tenhou.net. These numbers can be read on the right side of the lobby window.

Replays

Spectating

Game rooms

Romaji	Kanji	Rank qualification
Ippan	一般	四段 R1800 (or lower)
Joukyuu	上級	1新
Tokujou	特上	四段 R1800
Houou	鳳凰	七段 R2000

For Tenhou ranking, the game lobby is divided into four sub-rooms.

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.

The most important rules to note:

Uma (+20/+10/-10/-20)
Atozuke ari
Kuikae nashi
Kuitan ari or nashi option

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
▼	Tenhou points set to next base points for next rank

Four player

位	初期pt	東風戦				東南戦				昇段pt
位	初期pt	1位	2位	3位	4位	1位	2位	3位	4位	昇段pt
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	0				-10				-15	100
1級	0	上級 +40	上級 +10		-20	上級 +60	上級 +15		-30	100
初段	200				-30				-45	400▼
二段	400				-40				-60	800▼
三段	600				-50				-75	1200▼
四段	800	特上 +50	特上 +20		-60	特上 +75	特上 +30		-90	1600▼
五段	1000				-70				-105	2000▼
六段	1200				-80				-120	2400▼
七段	1400	鳳凰 +60	鳳凰 +30		-90	特上 +90	特上 +45		-135	2800▼
八段	1600				-100				-150	3200▼
九段	1800				-110				-165	3600▼
十段	2000				-120				-180	4000▼
天鳳位	Highest rank possible

Three player

位	初期pt	東風戦			東南戦			昇段pt
位	初期pt	1位	2位	3位	1位	2位	3位	昇段pt
新人	0	一般 +30	+0	0	一般 +45	+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	0			-10			-15	100
1級	0	上級 +50		-20	上級 +75		-45	400▼
初段	200			-30			-45	400▼
二段	400			-40			-60	800▼
三段	600			-50			-75	1200▼
四段	800	特上 +70		-60	特上 +105		-90	1600▼
五段	1000			-70			-105	2000▼
六段	1200			-80			-120	2400▼
七段	1400	鳳凰 +90		-90	特上 +135		-135	2800▼
八段	1600			-100			-150	3200▼
九段	1800			-110			-165	3600▼
十段	2000			-120			-180	4000▼
天鳳位	Highest rank possible