Frayed Knot wrote: Benjamin Grimm wrote: I guess that even if a ball is called foul by the umpire, you have to play it like it's fair, just in case. That's not going to happen. I don't see any way to keep players on both sides from reacting to the call as it's made, at which point it's left to the umps with the task of pretending to know how things would have occurred had the correct call been made initially. Can't. Say the RF dives for the ball and it's ruled a catch. David Wright turned second has to retreat to first, he can't go to third pretending it's fair, because if the rulings upheld he's thrown out at first. The RF dove to his right, so if it's a fair/trapped ball, he easily jogs into third and should probably be awarded it on the replay, but he can't go to third on the hopes it's fair. conversely, he can't pretend it's foul/caught either. That would mean retreating to first, where presumably Davis behind him is standing, because he's certainly not going to stand at home waiting to see the ruling. Now you've got guys crossing each other on the base paths. And you certainly can't stop play at the time of the ruling. So you're going to have to come up with very specific cases and what happens for each, and drill it into the umpires. Understanding that the players response is often a result of the umpires call. In my example above, just about every player is going to third. But say Ike Davis shouldn't be penalized for being on the first base side of second base when the call is make because he's slower and allows himself less space in case he needs to get back. Similarly on tag-up plays.