In China's chess, how to understand "the horse goes sideways and moves in all directions"?

In China's chess game, there are eight possible points. Actually? Every time the horse goes first (can advance or retreat), it will always tilt (or horizontally) again, which is commonly known as "the horse goes to the sun"! ! However, if there are chess pieces in the direction of "Sun" next to your horse. You can't leave. As shown in the following figure: those who check the box are allowed to walk (commonly known as not jumping horse legs), and those who cross the box are not allowed to walk (commonly known as jumping horse legs).

In this case, you should understand. If you still don't understand, please ask ~ ~