Prefer strategies that attack your opponent where he is weakest.
Always seek unfair advantages. If your opponent has a weakness in his game, or is unfamiliar with a technique, do not be afraid to exploit it. Actively seek strategies that are novel and unexpected.
Asymmetric warfare is the best way to combat opponents who are bigger, stronger, and/or more experienced.
Techniques that are shunned or called “cheap” are usually good candidates for asymmetric warfare.