城门诀 or others called as Castle Gate Feng Shui is when a good Feng Shui 旺山旺向will become even better, even more auspicious and longer and for those with bad Feng Shui like Up Mountain Down Water 上山下水 Castle Gate will help.
There are two types of Castle Gate. One is the priority and the other is sub. The main type for example uses 1,6 坎乾 kan-qian kua mutually letting Qi to go through and help each other’s and which borrow Qi for you to use; others uses 2,7 or 3,8 or 4,9 kua or sectors.
This is how Castle gate can be used. At the left and/or right of you main gate, open a Qi passage 气口 like a door and this left or right passage satisfied the 城门诀, which can borrow the auspicious Qi to help your main door.
After using 城门诀, even hostile flying stars fly into you main door, your left or right passage auspicious Qi will protect you.
But very unfortunate, for your house, there is no Castle Gate that you can use.
Cheers.
