Irensei

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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); Irensei can also play with the tool similar to the game of Go.

Black plays first, and players alternate in placing a stone of their color on an empty intersection. The winner is the first player to get an unbroken row of seven stones horizontally, vertically, or diagonally. However, when it is enclosed by the enemy, the stone is removed. Irensei is a game for the game of Go to unite with the Gomoku.