All the cases in which Kogen was put into practice were emergencies in the capital; all the Kokufu (an ancient provincial office) of the Sangen provinces was positioned at the east side of each seki, namely, outside of seki when it was seen from the capital; and so on.
実際に固関が行なわれたケースが全て中央での非常事態である事、三関国の国府がいずれも関の東、すなわち中央から見て関の外側に位置している事など、である。