Excerpted from Combat Strategy by "Hanho" *(Sang H. Kim)

Combinations can be classified by the force that they apply. Force classifications are defined by the direction in which they apply force to the opponent. Consequently, they are often more difficult to identify than directional classifications. Force is an internal characteristic that is not readily evident to an observer. It can be obvious, as in unified force or deceptive as in opposing force.

Unified force combinations

Unified force combinations are groups of skills that apply continuous force in a single direction. Every strike serves to magnify the effect of the previous one. Strikes can be the same such as a flurry of punches to the body or they can be diverse like a variety of linear and circular kicks aimed at the legs of the opponent.