The more you tell a horse to bugger off and get moving, the more it wants to be with you, in my experience, when we had a horse that was hard to catch, the easiest way to get it to come back to you was to try to separate it from the herd (i've never owned just one horse). The more you shoo him off the more he wants back in.
The way he gets back in is by letting himself be caught. You're practicing reverse horse psychology 101 with this method. Horses are hardwired to want to be with the herd. Bannishment from the herd is usually the end of the line for wild horses.
I've had to do this a few times and it works especially well if you only have a couple horses.
I'll take one out of the pasture and stand a good 40 yards on the other side of the gate....Guess who's at the gate wanting to be back with the herd, yep you guessed it, Mr. Hard to catch himself!