3 Tips for Bachhand Topspin against Backspin

Starts at 4:42

Thanks for your sharing. I've checked it, but I think that His BH and My BH is a little bit different.

It could be different for BH by Coach in my opinion.

Can you please show your backhand?

I honestly think you are complicating a topic unnecessarily.   Everyone has a different backhand but they all have the same circular and speed production principles as the forehand.   The minor adjustments are to provide a different quality of ball either with more speed or spin depending on the incoming speed or spin.

When I was looping backspin at USATY 1700,  one of my coaches who has never been to Korea, said that there as a difference between the upward lifting motion and the forward drive motion and encouraged me to enf the  upward circular portion of my stroke when I made contact with the balland to finish more forward.. All he is asking the TTR hunter to do is to add more forward motion into the contact once the backspin has been handled.  He is looking for a different quality of ball.  When a coach is trying to get more out of your technique,  that is what a coach does.  Making it sound like a new backhand is just going to confuse people.

What I am saying is that both players are trying to get a quality ball.   When they were younger, someone taught them to play a backhand and they did something and got a quality ball.  Then another coach got them and tried to make it better and asked for this instead of that.  And they did what they thought the coach said and changed it. And so on.  You are seeing the end product now and talking about it as if the player is choosing to play that way, but that is not how technique is developed .No one said  'use the elbow like this and the wrist like this and let the wrist finish here and the elbow go there etc."  When people talk about technique like that, as long as they are not saying that this is how the technique was taught, it is okay.

What the coaches were trying to do was to teach and get a quality ball.  If you look at Ma Long, he modifies his grip seriously yo play backhand.  So does Timo and Dima.  No one said "well you must do your thumb like this and your wrist like this". It is experimentation to get a quality ball. 

It's not new - and the way I have always understood is a swing trajectory adjustment to trap topspin.  I don't understand it so much as punching down but spinning over the ball forward to bring the ball down.

I do think Tt Gold makes a good point in distinguishing between straighter (more "natural") and more elliptical ("pressing" or "ripping") swing trajectories. You can generate more power with an elliptical trajectory because you can fit a longer swing into the same space. The cost is that your swing direction is changing moment to moment so you need better timing.

Ball contact is the only part of the swing trajectory that counts for what the ball does. A downward follow through after the ball is headed back in the other direction has no effect on the spin or flight path of the ball. Of course follow through counts for recovery, and every part of the swing trajectory is connected to every other part, and everything including what you had for breakfast the morning of the tournament counts for how much power you generate. 

If you're talking about how best to conceptualize hitting the ball then I agree that it's not helpful to think only about the moment of contact. In that sense it might be useful to think metaphorically about "turning" the ball with a particular follow through even though your follow through is doing no such thing. 

I wasn't aware of giving any advice but if I do I think I'll put it on a website called Stupid Table Tennis. In the meantime, I'm sure you can find videos on deceptive serves, snakes, etc., to see how follow through doesn't effect spin.

Exactly.  Which is why I said good physics, bad table tennis.  What happens before and after both affect how the ball is contacted.  It affects how the racket is moving (speed and direction) at the point of contact.  I remember when someone said it didn't, I tried to build my table tennis around the idea.  But as I got better, I realized how stupid it was as a naive statement.  IT's one thing to swing, and then do all kinds of nonsense after like people do on serves where they serve then do all kinds of rubbish AFTER the serve is completed (which is not the follow through).  But the racket trajectory and speed is determined by a lot of things including the size of the follow through, and the trajectory and speed are practically unique for a particular way of approaching the ball.  Of course, in theory, all that matter is what happens at the ball.  But can you gain speed and decelerate  and get the same racket trajectory that creates a specific type of spin and speed vector with a different swing?  Yes if you think it is a physics problem, like many low level TT players do.  But not if you try it and realize that the quality of the follow through in some ways affects the quality of the swing.

Your AB line segment is real but short. Contact time between ball and rubber is only a few milliseconds, not enough time for the ball to travel on the rubber more than a small fraction of its own diameter. Even so it's meaningful, not because the ball moves on the rubber but because the forces applied to the ball change depending on the relative positions of A and B, which in turn depend on the swing trajectory during the few milliseconds of contact.

The early part of follow through -- immediately after contact -- depends on swing trajectory during contact because you can't change trajectory instantaneously. But eventually you can change it, often fast enough to be deceptive, and so the rest of the follow through doesn't necessarily have anything to do with what the ball is doing. Deception may be the most typical reason to modify a natural follow through, but there's also faster recovery, less stress on shoulder or elbow, etc.