From Sega Retro


Sansan title.png

System(s): Sega Mega Drive
Publisher: Sansan
Peripherals supported: Sega Mega Modem
Genre: Table

Number of players: 1-2
Release Date RRP Code
Sega Mega Drive

Sansan (サンサン) is an online service allowing people living in Japan to play the abstract strategy board game Go with other subscribers over the internet on a Windows PC. However, at its launch in 1994, a version for the Sega Mega Drive was also made available. This version of the game allows players who have a Sega Mega Modem to connect over a 33.3kbps or ISDN line to play other members who have a Sansan ID. However, as of 2011, there are no known Mega Drive-compatible Sansan servers. A local two-player version of the game is also included for play.

Due to the late release, the Mega Drive version did not last very long — it is one of the rarest and most sought-after Mega Drive games; Sega of Japan's official archive doesn't list it (despite Sansan Co., Ltd. having T-series code T-147) and a ROM was not dumped until February 2011. The Windows PC version of the service continues to this day.


Sansan gameplay.png

Two players, Black and White, take turns placing a stone (game piece) of their own color on a vacant point (intersection) of the grid on a Go board by pressing C. Black moves first. The official grid comprises 19×19 lines. Vertically and horizontally adjacent stones of the same color form a chain (also called a string) that shares its liberties (see below) in common, cannot subsequently be subdivided, and in effect becomes a single larger stone. Only stones connected to one another by the lines on the board create a chain; stones that are diagonally adjacent are not connected. Chains may be expanded by placing additional stones on adjacent intersections, and can be connected together by placing a stone on an intersection that is adjacent to two or more chains of the same color.

A vacant point adjacent to a stone is called a liberty for that stone. Stones in a chain share their liberties. A chain of stones must have at least one liberty to remain on the board. When a chain is surrounded by opposing stones so that it has no liberties, it is captured and removed from the board. Players are not allowed to make a move that returns the game to a previous position. This rule, called the ko rule (from the Japanese 劫 kō "eon"), prevents unending repetition. Instead of placing a stone, a player may pass. This usually occurs when they believe no useful moves remain. When both players pass consecutively, the game ends and is then scored.

Magazine articles

Main article: Sansan/Magazine articles.

Physical scans

Mega Drive, JP
Sansan md jp cover.jpg
Sansan cart.jpg

Technical information

ROM dump status

System Hash Size Build Date Source Comments
Sega Mega Drive
CRC32 5b85deed
MD5 13d52a1991a6569edb71cfb939318949
SHA-1 e882c3af57884862bafc764226c88c287752e9d6
1MB 1994-05 Cartridge (JP)

External links


  1. (Wayback Machine: 2001-03-11 15:25)