In Kuichigai-koguchi entrances, earthworks or stone walls were built in different directions, not in parallel, and an entrance was constructed at the side so that the enemy was compelled to follow the S-shaped pathway.
喰違虎口（くいちがいこぐち）は土塁や石垣を平行ではなく、食い違いにすることによって、開口部を側面に設け、攻城側はS字の進路を取らざるを得なくなった。