In the politics of the seven kingdoms for the reach you mention that Garth X shows how difficult it is to lose the great game, what would be the cause of this difficulty? After all, it’s not like with the riverlands where everyone gangs up on a single ascendant kingdom but carving up a failing one, yet the reach shrugs off all the issues it had faced.

Because the Reach’s problem under Garth X was due to a temporary problem of weak leadership, rather than a fundamental problem of a failed state or a lack of resources.Thus, once Osmund Tyrell took over leadership, the Reach was able to pretty quickly rebuild itself.