It is said that according to the physiognomy of a house, Ote-mon (main gate) should be located to the south-east of the center of the castle (honmaru or goten), and a corner located to the north-east (direction of demon's gate) of the center of the castle should be removed by carrying out Sumikaki (corner cutting) in order to avoid the influence of the demon.
本丸の中心、若しくは、御殿の中心を中央として、大手門を南東に、鬼門となる北東には角を立てずに鬼門除けとなる隅欠きをするとよいといわれていた。