How to cut off
The ring is a square. Imagine the ring is divided into four smaller equally sized squares by a lines that cross at the center of the ring. As you are moving about the ring, never let your opponent turn and cross one of these imaginary lines. Cut the opponent off by mirroring his or her movement, not by following him or her. Stay even with the opponent and stop his or her movement by throwing hooks in the direction he or she wants to move, this techniques is known as "hooking off" the opponent.
When you have an opponent in a corner, imagine it is one corner of a triangle and keep the opponent contained within the triangle. Keeping giving the opponent smaller and smaller boxes to work within, not allowing room for the opponent to roll out. If an opponent turns a corner and passes over your imaginary line, immediately adjust and start a new box. Move forward and toward the opponent's off side, not backward.