Irensei

Last updated
Irensei
Players 2
Setup time None
Playing time casual: 5-30 minutes
tournament: 1-2 hours*
Random chance None
Skill(s) required Strategy, Observation

Irensei (Japanese : 囲連星) is an abstract strategy board game. It is traditionally played with Go pieces (black and white stones) on a Go board (19x19 intersections), but any equipment with which Go can be played is also suitable for Irensei.

Japanese is an East Asian language spoken by about 128 million people, primarily in Japan, where it is the national language. It is a member of the Japonic language family, and its relation to other languages, such as Korean, is debated. Japanese has been grouped with language families such as Ainu, Austroasiatic, and the now-discredited Altaic, but none of these proposals has gained widespread acceptance.

Board game game that involves counters or pieces moved or placed on a pre-marked surface or "board", according to a set of rules

A board game is a tabletop game that involves counters or pieces moved or placed on a pre-marked surface or "board", according to a set of rules. Some games are based on pure strategy, but many contain an element of chance; and some are purely chance, with no element of skill.

Black plays first, and players alternate in placing a stone of their colour on an empty intersection. The winner is the first player to get an unbroken row of seven stones horizontally, vertically, or diagonally.

There are two restrictions on this: (1) A line of seven stones which covers any point on the outer two lines of the board is not a win, and (2) Black cannot make a line of eight or more stones. However, when a group of stones is enclosed by the enemy as by the Go rules, the stones are removed (remember that diagonal is not considered a connection for capturing but is considered a connection for a win). Also, the suicide and Ko rules apply, and indeed are often crucial in winning the game.

Life and death

Life and death (死活) is a fundamental concept in the game of Go, where the status of a distinct group of stones is determined as either being "alive", where they may remain on the board indefinitely, or "dead," where the group will be lost as "captured". The basic idea can be summarized by:

Thus Irensei is a game that unites elements of the game of Go with those of Gomoku. Similar to Atari-Go, it may be played to become familiar with aspects of Go, but is interesting on its own.

<i>Gomoku</i>

Gomoku, also called Five in a Row, is an abstract strategy board game. It is traditionally played with Go pieces on a Go board, using 15×15 of the 19×19 grid intersections. Because pieces are not moved or removed from the board, Gomoku may also be played as a paper-and-pencil game. The game is known in several countries under different names.

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