[WC_Lun]

Jamming is cutting his technique of before he can really launch it. It can be done with punching and kicking. Probably the most famous example of this is Bruce Lee's stop kick. Trapping is ...well trapping the opponent's limbs against his body limiting his use of them. These are always followed up with a strike, throw, etc. Splitting is the most advanced. Its splitting the attackers power. Its done by forcing the energy of the strike away from your body in the instance of straight attacks, done by taking the center. In the instance of hooks and such it is splitting the power away from the opponent's body. This keeps the power they can apply limited. These are simplified explanations and don't really explain much. Like most things in martial arts, you have to experience them to really understand what I'm saying. If you have a coach or instructor, ask him about them.