In Hnefatafl the defending side comprises twelve soldiers and a king, who start the game in the centre of the board. Their objective is for the king to escape by reaching any of the four corner squares. The attackers comprise twenty four soldiers positioned in four groups of four around the perimeter of the board. Their objective is to take the King. All pieces move like the Rook in chess and pieces are taken by "sandwiching" i.e. moving your piece so that an opponent's piece is trapped horizontally or vertically between two of yours. The attacking side starts first.