Irensei is a mixture of Go and Gomoku played on a Go Board (19x19). Players win the game by getting seven stones in a row of their color. In addition, they may capture and eliminate enemy stones in the same way that is done in Go. The winning condition is to have seven in a row, vertically, diagonally, or horizontally, if and only if all these stones are inside the central 15x15 square. i.e. not on the two lines from the edge of the board. For balancing purposes however, Black, the first player, loses when he makes eight in a row or more. The capture, Ko, and no-suicide rules from Go apply. There is an exception to the no-suicide rule: if a stone placed in a suicide position completes a seven-in-a-row, then it is a win.

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