Gomoku

Connect exactly 5 of the same stones in a row (horizontally, vertically or diagonally).

Put your marker on any empty intersection of the board. Try to make a line of five pieces in a line, either sideways, vertically, or diagonally. Prevent your competitor from achieving their own sequence of five. Switch setting markers with your competitor until one participant achieves in making a row of 5. Remember that the contest concludes immediately when a sequence of five is made, with no need to cover the entire board.