Probe him and learn where his strength is abundant and where deficient.

Engage people with what they expect; it is what they are able to discern and confirms their projections. It settles them into predictable patterns of response, occupying their minds while you wait for the extraordinary moment - that which they cannot anticipate.

Do not press an enemy at bay.

The skilful employer of men will employ the wise man, the brave man, the covetous man, and the stupid man.

Move not unless you see an advantage; use not your troops unless there is something to be gained; fight not unless the position is critical.

Plan for what is difficult while it is easy, do what is great while it is small.

The value of time, that is of being a little ahead of your opponent, often provides greater advantage than superior numbers or greater resources.