How Can I Identify How To Beat My Computer At Chess?
Basically, you have to find out what level your computer plays at. And then train to beat that level.

Computers are very good at looking deep into "branches" of moves. That's where they have an advantage over humans, and that's why the best ones can beat Gary Kasparov.

Computers aren't quite as good at certain "judgmental" aspects of chess, like when to sacrifice a pawn for a positional advantage. They tend not to do as well in a middle game as in either the opening (when there are few pieces out) or the endgame (when there are few pieces left).

Basically, you need to get to the point where your "branching" reading is almost (but not quite) as good as your computers. Then you have to steer for a complicated middle game, where the computer's branching algorithm may break down, while your better judgment prevails. (That's what Kasparov tried to do.) As good as they are, it's fun to see a computer get confused when you throw a "curve ball" at them, in any application. 

That should happen to your computer at "some" level of play. Hopefully it won't be too much higher than yours.