Gomoku is an old two-player abstract strategy game generally played with Go pieces on a 15x15 (or 19x19) Go board. The objective of the game is to be the first player to create a sequence of five same-colored pieces vertically, horizontally, or diagonally.
Players alternate turn to place their piece on an empty intersection in the board. Once a piece has been placed on the board, it can not be removed.
The winner is the first player who creates a sequence of 5 consecutive pieces vertically, horizontally, or diagonally.