Chickens have more & better evasive moves than professional football players eluding tackles. I rarely try to catch them just like that.
Instead, I have them trained to come when they hear the sound of cracked corn rattling in a coffee can. Some will stand still while they eat so you can just pick them up then, or sneak up on them from behind. Others are still wary, although they'll come for the corn. With those I'll put some corn in a wire dog kennel. When they go in to eat I close the door. Then it's easier to reach in and grab them.
But if at all possible to wait until after dark, I will delay my chicken-grabbing until then, and simply pick them off their perches.