The object of this game is to capture your opponent's pieces by trapping them between yours. Each turn, you must drop a piece on an empty cell that results in a line being formed with your pieces at both ends, and one or more of your opponent's pieces in the middle. You will take control of all the opposing pieces in the line. If your move creates more than one line, you will capture pieces in all the lines. If you have no valid moves, you must pass. The game is over when one player's pieces are completely eliminated, or when the board is full. The winner is the player who controls the most pieces.

By playing a piece in the highlighted corner cell, player 1 (red) will capture the 3 blue pieces in the diagonal line. Corners are especially valuable because once a piece is placed in a corner it can't be captured.