The importance of flexibility and adaptation to change can't be overemphasized for the purpose of good, strategic positioning. The truly great martial artists are aware of this tactic, which suggests not holding to a fixed plan of attack, but instead changing according to the unfolding of events.
It is impossible to anticipate all eventualities. The best way to plan for something unpredictable is to not be afraid to adapt. If you talk about the possibility of unpredictable circumstances and understand the importance of adjusting to change, you will be better prepared to shift when change does occur.