 Doesn't really walk anybody. And what really tells the story to me, I'm not sure this is going to sound more complicated than it is. Run value sounds scary. All it really is is just measuring how good are the results against a given pitch. Are hitters hitting it? Are they hitting for power? Are they chasing it? So on and so forth. All three types of pitches, fastballs, breaking balls, and off-speed pitches would go in the category of highly effective.