[M.O'Reilly]

If you want to quantify something, here is what I recommend: Count the number of shots attempted by the opposing robot. That is, the number of shots that actually make it to the alliance station wall. Whether they are blocked, or just never fired in the first place doesn't really matter, because if it doesn't get near the goal, it doesn't matter. The best kind of defense is preventing any discs from getting anywhere near the goal. This is a tricky stat to track when the defense bounces from one robot to the next. But, if the defender is actively getting in the way, count the total shots that get through.

Another important stat is the robots ability to prevent a hang. A good defender can make up for not hanging itself by keeping an opposing robot away from their pyramid.