Irensei

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.