Sun Tzu's six rules describing the common situations that arise the earliest in campaigns.
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This article explains that Sun Tzu taught that there are three common situations that arise when we begin to explore an opportunity. These situations represent our most likely initial discoveries when exploring a new area. We might assume the entire campaign will assume the character of its earliest stages, but this perspective is simply wrong. Sun Tzu taught that the initial classes of conditions are the most temporary. Reacting inappropriately to these three situations and the campaign simply ends in failure. However, reacting correctly usually means that the current campaign stage evolves into a new situation.