Fore checking is defensive hockey. It seems there are as many fore checking systems are there are coaches. These systems are used to regain control of the puck mainly in the offensive zone. Here is one simple example that can be used in both the offensive and neutral zones.

 Assume our team has shot the puck deep into the right hand side of the other teams end. Their defense man has the puck. Our first man over their blue line or closest to the puck should go for the puck carrier. Our second player over the blue line should cover the winger on the same side of the rink as the puck and the first man in. The trailer or 3rd forward in should line up in the slot; generally in the high slot area between the face off dots. This is where he most likely can intercept a pass across the rink or may chase a pass or the puck carrier skating behind the net.