Alright, this doesn't compute. If you're throwing a round kick with your lead leg while you're leaning directly back, away from your target, the kicks will not be "very powerful". Physics just isn't on your side here. Force equals mass times acceleration, and what you're describing keeps most of your mass out of the technique and doesn't offer the technique a whole lot of time to build up that acceleration.
The first way to prevent getting hit with a round kick is the most basic way to prevent getting hit with anything: be out of the line of fire. It should be pretty simple if I have even decent footwork- against an unmatched lead, I generally try to get my lead foot to the outside of theirs. From that position, they can't hit me with a lead round kick unless they change that position.
The second option is to sit back, wait until you get into range, and (if I'm playing the counter game instead of initiating) just check the kick. If you're too far away to throw anything else, as you're supposing, I don't have to WORRY about anything else. Crashing your instep or shin into my knee repeatedly with either deter you or cripple you; either way, that round kick is out of the equation.
There are other options, too. If I know that kick is coming (and again, from what you're describing, that's a very likely scenario) I can simply shift my thigh so that the kick will ride up it's length, enabling me to catch the kick. From there, I can counter with a strike of my own, or go for a throw or takedown. I can also take my leg out of the way by stepping back and momentarily shifting stances. If you're truly throwing a "very powerful" kick, then you'll be slow to recover, and it'll be easy for me to attack your leg with a kick of my own.
"I wont set them up with punches I will use them from long range before I get into punching range."
Couple of points. First, "punching range" isn't the same for everyone. If you're very tall, you might be able to consistently kick someone before they're close enough to punch you. If you're anywhere close to the same height, you're already ready to be hit, or at best just a half-step away from being hit. If your opponent has a reach advantage, you may end up in "punching range" no matter how far away you kick him. You also have to consider that the round kick to the leg isn't the longest-ranged weapon; the round kick cuts down on your range somewhat, and kicking below the level of your hip means you have to get kind of close. Second, if you don't give the other guy something besides the kick to think about, you're going to lose the exchanges most of the time. Chances are you're going to telegraph it somehow, most likely by shifting your weight, and the guy will be prepared. Set-ups exist for a reason.
I like using my lead round kick. So do many of my sparring partners. Some of us have been throwing these kicks since we were in single digit ages. I find it has its best uses as a counter. If you try to just plug away from a distance, it's pretty easy to deal with.
"I will also from a long distance side kick you the the knee with my right lead leg to your left lead leg knee. ...I will also be leaning back a bit with the side kick so you cant counter with a jabb or cross to my head."
Same deal. First defense is to get off line. In order to have any power in that kick, your shoulder, hip, and foot are going to have to line up, so if I stay out of the angle where that happens, I don't have to worry about the kick. I can also raise my knee as a sort of check, giving opposing force. As with the round kick, I can take my lead leg out of the way and then counter when you miss. Also, if you're leaning away from the direction you're trying to kick, you're not going to have a whole lot of power. I might just even walk right through that kick to get to you.
In general, the easiest way to counter lead leg kicks is to make the guy come at you. At some point he's going to have to put his weight on his lead leg in order to draw his rear leg back into his stance. THAT'S the time to attack. Also, clinching and fighting on the inside help.
As others have pointed out, what you just described is straight up poor technique, even if you hit with the first leg kick it wouldn't cause enough damage to make a person with any experience hesitate for even a fraction of a second. And secondly there are ton's of techniques to deal with what you said, like checking the first kick then stepping in and catching the follow up while executing a sweep. Or taking a slight step back and then countering with your own leg kick followed by a straight or hook depending on the leg you use for the counter. Or as others have said, go in for the takedown when you are open.
With the poor technique you described any number of possibilities are open. I personally would probably just check the kick and close the distance with a step-in jab or straight to the jaw.
EDIT
If you look at the leg kicks the Fyoder does he is not leaning back at all, this lead leg kick is done exactly how they teach it in Sanda/Sanshou. His back is straight and he twists his body and shoots his hips forward to whip out the kick. If you were watching closely he was actually leaning forward ever so slightly so he could step in and execute a follow up combination if he was able.
Check the leg kick, then answer with a low/medium/high left roundhouse. Or I would close the distance after the check (stepping in with the left after check) and counter with the right hand. These are usually standard counters taught in Muay Thai.
Going from a low roundhouse to the same side kick is risky and typically doesn't flow well. It may work against a less aggressive fighter, but most of the time you'd have trouble with the your opponents closing in, distancing out, or deflecting/countering you.
You really have no real experience do you? Comments like, "I wiill lean back so you cant punch me in the face with a counter straight right or left jab. (I will be out of range from those)" show a basic assumption and no follow through in your thinking. First you assume that you will be successful in landing effective kicks. They might get blocked or deflected. Even if you kick and it gets in leaning back out of punching reach means that immediately after kicking, you must straighten back up. any experienced fighter knows this and will time his punch to the face so that it lands while you are straightening up and recovering your composure. Fighting is about technique. But after developing good individual techniques it is even more about how they are used. The best fighters always use techniques with overlapping timing. If you fight one technique at a time, you are very likely to get into trouble quickly against anyone with better skills for using overlapping technique. The best time to attack is during the incoming attack. I love for someone to kick, punch,....etc. first. I will deal with the incoming attack while at the same time counter putting me immediately in control of the attacker. Do yourself a favor and get off the computer and go train with someone that is highly qualified. This mindset you have is going to get you only so far. When you fight someone good you will find out quickly how little you really know.
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Let you get a couple of free non-contact kicks in first to gauge distance then pre-empt the technique trap the leg at the ankle/thigh bring you to ground and deal with you there.
Alternatively bring the lead leg up to defend then execute a jump front kick head height (a bit snazzy but i have seen it done).
You would be easy to defeat because you are wild, and not in control of yourself.
That gives opportunity for your opponent to gain and keep control.
Those tactics wouldn't stand a chance against even a mediocre fighter.
Plus, I suspect I have more reach and range than you, so you are screwed again.
i would stay out of range, wait for you to attempt range kicks then shoot in for a take down then submit you on the ground within a short amount of time. then i would leave while you regain your senses or are crying from the damage of a joint submission. or i would close gap and take you down then submit you.
Since there are no weapons, other people or environment to worry about i would take you to my strengths and finish it real quick with a minimum of fuss.
Step in with a leg check to block the kick and follow through with punches.
You have a long way to go grass hopper. Go spar and come back when you have some experience.
The Nagasaki move
I'm left handed too -winks- lets make babies so there'll be more south paws out there! :D
I am southpaw, lets pretend you are orthodox.
I will throw some very powerful right leg round kicks to the outside of your left leg. Remember since I am a southpaw my right leg is the leg up front.
I wont set them up with punches I will use them from long range before I get into punching range.
I wiill lean back so you cant punch me in the face with a counter straight right or left jab. (I will be out of range from those)
I will also from a long distance side kick you the the knee with my right lead leg to your left lead leg knee. After the side kick is throw I will bounce back to creat distance (as is taught in san shou) I will also be leaning back a bit with the side kick so you cant counter with a jabb or cross to my head.
How would you counter me when I use these two kicks which I like to lead with from long range?
I would step back and throw a hadouken fireball at you.
i would kick you in the nutts & then drop a soccer kick when you fell.
I'd show you grapple.
