The Thai sweep wouldn't, but the others would anything that lifts my root from behind like that or causes me to bend forward or backward on the stance would break it with no problem.
Part of the skill set for people who are good at that sort of sweep is to either pick a moment when your foot is planted and you can't lift it out of the way or else to force you into a position where your foot is planted and you can't lift it out of the way in time.
Agree! Timing is important when you apply "sweep". Sometime you may need extra "set up". Here are 2 examples.
Sweeps are my specialty so I'm hyper-sensitive to any opportunities that open up for a sweep. This has also helps with defending against sweeps as well. The best thing about a sweep is that the lower your stance is the less effective and less damaging the sweep will be. When you see videos of people getting swept it's usually when they are standing tall or in a high stance. Here are a few videos of guys getting laid out by sweeps. Punches and kicks are awesome but there's nothing in the world that feels like hitting the ground.
In the first video guy swept the other guys rear weighted leg. Notice guy in white shirt failed his sweep of front leg which wasn't weighted? Then guy with blue shirt swept weighted leg successfully? Second video is drunken kungfu where these rules may not apply. In Karate Kid 3 Daniel Son received a book on sweeps from Master Terry Silver. All this info is in that book. Tournament guys are suckers for the sweep.
Oh yeah, problem I see with sinking and widening your stance is loosing mobility. In a way you're weighting yourself and making it easier to be taken down. Unless it's a sprawl
Sweeping the weighted leg is the most common method, not the easiest. I do both of these sweeps all the time. If you are walking and I prevent your lead foot from landing to receive the weight then you will fall and it will take less energy and effort to make that happen. If you are retreating from me and I sweep you so that your feet cannot move backwards then you will fall. In both cases this occurs because the non-weighted leg can not land. If I crank the sweep then you will fly.
Here's a picture of me sweeping the non rooted leg
Yes but only if the stance is too wide like what Jake Mace was doing in the picture of him in a super wide horse stance.
I think Wing Chun is limited on the types of sweeps that they do within the system, there are a lot of sweeps that I do that aren't in the Wing Chun fighting system "as far as I can tell" The higher you stance the more limited you'll be with the types of sweeps that you'll be able to do. Sweeping a leg with at least 50% of your opponent's weight on it may be the only option because of the structure of the fighting system.
Sounds like you're saying the probability of sweeping A unrooted leg is less? I like to keep my odds in the higher percentile. In your other post about widening your stance you gave s bunch of different options that might work. But again I prefer doing stuff that's proven and might always work. Look at the 4 year olds in my video. They aren't in a crouching tiger stance. Actually, watch any straight jujitsu tournament they stay pretty upright. My guess is for mobility and not committing there weight one way or the other? They're always trying to sweep each other's legs out. I think there's points for that? Either way same principles apply.Here's a picture of me sweeping the non rooted leg
From let to right.
Frame 1: The front leg is rooted.
Frame 2: The front leg is no longer rooted (View the shadow differences that the heel makes.
Frame 3: The front leg begins to move at this moment the majority of his weight is on his back leg.
Had I swept his weighted leg his body position would have changed dramatically, but in the photos you can clearly see that it hasn't. He was actually able to stay rooted on that leg right up until the point that front leg crossed his rooted leg.
Sorry about the bad quality of this next picture (below)
The first picture shows me sweeping his unrooted leg. He lifts his leg to avoid a low sweep. In this picture the goal wasn't to seep the rooted leg because it would have caused injury, so I swept the unrooted leg. My opponent was expecting my leg to pass under his in which he could plant the unrooted leg. The problem is he's not able to because I'm redirecting that unrooted leg with my sweep. As you can see he's about to hit the ground and he would have had I actually did the sweep with any force. The sweep wasn't even fast it was just a tap which was more than enough to disrupt his intentions of planting that foot.
The majority of the schools if not all of them teach to sweep the rooted leg because it's the easiest to identify and the timing required to sweep the rooted leg is more forgiving. Sweeping the unrooted leg takes a little more timing because you have such a short window. You can see me fail at a sweep attempt in the video here at the :027 mark. I tried to knock his leg out of the way right before he plants it. My timing was off and he was almost able to take me down because if it. Had I not been as low as I was he would have.
