A game is played on a board marked with a square array of horizontal and vertical rows of elemental squares. First and second players initially hold a set of first pieces such as black round pieces and a set of second pieces such as red round pieces, respectively. Each player alternately places a piece at an unoccupied square, trying to occupy all the locations of one horizontal or vertical row, to use up all the piece of the hand, and to capture more opponent's pieces. Each side can place a new piece if the new piece is horizontally or vertically adjacent to a comrade piece on the board. If the new piece is horizontally or vertically adjacent to an enemy piece on the board, the new piece and the adjacent enemy piece are replaced. Pieces are captured if is they are completely enclosed and there are no adjacent unoccupied locations.