I have spent 10 years crunching numbers endlessly trying to find that hidden gem that works. Run lines, puck lines, regulation lines, reverse middles, etc. etc. etc. Here is what I've learned. If something works, a lot of people would be doing it and you would know about it by now. Trust me when I say this--if betting the runline regularly was a good idea, it would not have such major opposition on this board, and you would see picks all over the place by the top cappers here that contained a bunch of runlines. But the fact is, you might see one or two runlines a day. In summary, play runlines sparingly, and be very, very judicious about when you use them. If making regular use of them was a good idea, many people here would have figured it out by now and use them extensively.