I agree 100%!!! And with those I'll add Decisiveness, Determination & Heart....
For an example of intent watch this:
http://www.youtube.com/watch?v=_oBvUd3df28
I have also seen footage of a gazelle being dragged into the water by an absolutely humongous crocodile. The gazelle struggled for what seemed like an eternity and then out of no were the crocodile let loose and the gazelle ran off. Now, none of this made sense until the camera zoomed in and showed that despite the utter power and devastating weapons of the croc this little gazelle was able to turn itself around and jab the crocodile RIGHT IN THE EYE, therefore saving his/her own life.
Similarly, I have seen skilled fighters have a heck of a time with much less skilled fighters out of the pure fact that the less skill fighter had heart or was more determined or had greater focus or was simply more decisive.
Parsec