irensei Traditional game of Japan [go , gobang]
Irensei is similar to connect five, but Irensei can be removed enclosed stones like go.

 Play example of Irensei
Black places a stone and the game started(1),
and players alternate in placing a stone of their color on an empty intersection.(2,3)
White was effective in the enclosure of Black.(8)
The stone has been removed in white though the black was able to continue without noticing.(14)
It is necessary to note this rule "The enclosed stone is removed".
Because White is not stopped to Black, it already tries to get an unbroken line of seven stones previously.
But It has been defended by White.(16)
It became a win of White.

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