The invented game includes a playing field with a pattern of defined areas adjacent to one another, sets of playing pieces for each player, and a single marking piece which is several times the height of a playing piece. The playing pieces are configured such that they are stackable on top of one...http://www.google.com.au/patents/US5839727?utm_source=gb-gplus-sharePatent US5839727 - Game and a method of playing a board game
