While the frontiers work officially when two countries have agreed on their delimitation, in geostrategic reality they are based more on the physical boundary, because this is more stable since they are not dependent by conventions which may subsequently be disputed. So we see that the frontiers, when they are not substantiated from the edges, they are condemned to change because they don’t have temporal robustness. In chess, the notion of the front, when it is stable, plays with the edge. It is this idea which explains the use of castling and especially the short one, in a defensive phase. However in order to see a more advanced form we must analyze the positions of Go and especially its relations with the edges. The notion of hosi is the first one which doesn’t belong to the edges but is affected in a direct manner. This phenomenon is not only obvious with the fuseki, but in essence it explains also the deepest of them when of course we have the classic dimensions of goban, because with the smaller sizes, the influence of the tactics erases the schemes which would appear on a strategic level. This of course doesn’t mean that the notion of the edge doesn’t also influence the tactics, since we see it clearly in the case of semeai but also with feedback, in case of uttegaeshi. So in practice even if geopolitics seems clear, the frontiers are always more stable when it follows a geostrategic mental scheme, because this is substantiated with the notion of the edge. Let this be learnt by some so that they understand the history of the future.