“The art of war recognises nine varieties of ground: dispersive, facile, contentious, open, ground of intersecting highways, serious, difficult, hemmed-in, and desperate.”
Situations differ by the ground you are on; classify correctly and the right rule follows.
Chapter 11 opens with its master taxonomy: nine varieties of ground — dispersive, facile, contentious, open, intersecting, serious, difficult, hemmed-in, and desperate. Where Chapter 10 named six terrains, these nine are psychological as much as geographical: each is classified by what it does to the men who stand on it. Hence the coming rules concern not just movement but morale, unity, and desperation.
An executive reframes her company’s stalled initiative through the nine grounds and the vocabulary clarifies instantly: the home-market skunkworks is dispersive (every participant’s loyalty is split with their day job — do not fight there), the new segment is facile (entered shallowly — push through or leave), and the regulatory dependency is hemmed-in ground (only stratagem opens it). One meeting replaces three months of circular debate.
The nine grounds are not nine difficulties to avoid — several are the best ground available (desperate ground produces the strongest fighting force in the book), and the chapter’s rules often exploit rather than escape each ground. The taxonomy’s power is diagnostic honesty about psychology: naming what your ground is doing to your people, because that — not the map — determines what they can do next.