He's got your number and that you give up. What I'd like you to do when you enter the field is to circle way around until you are behind him. Try not to look at him just yet. When you are lined up directly behind, begin to approach, before you get within kicking distance, if he hasn't move, move him as tho shooing chickens with as little energy as possible. You want him to move, not hightail for the far reaches. Walk to the spot where he was at and stand there about 15 seconds, then circle him again. You are mimicing a dominant horse and telling him I'm eating there. As you continue to circle him he will begin to make it harder as he will want to keep both eyes on you. Good. If he will stand and face you, good. If he turns his head to his right, turn your to your right. This simple movement will draw him back. If he turns and starts to walk away, you must immediately do it also so he thinks it was your idea. As soon as he stops, begin your circle again. Now he should be getting uncomfortable with this. This time when he stands and you must have both eyes, slump your shoulders a little and approach with your arm extended a bit and offer the back of your knuckles. If he offers his nose, don't go the last inch, he comes to you. When he does, back up three or four steps, turn your back to him and check out the scenery. This releases the pressure on him. This is a good time to leave him alone if you must. Repeat the entire exercise the next time. He may want to greet you much sooner than before or even follow you as you step back and turn away. You are establishing your authority over him and most horses are happy to give up leadership as it's a big job. When you enter the pasture, always have your lead rope and halter hanging in your left elbow in plain sight. When you do get him haltered, bring him out, offer a little feed, do some grooming and put him away. I did this 5 times one day and the next morning the horse was at the gate hollering for me.