Below is an explanation of what back-hand english is from the following link:
http://www.greatpool.com/technique.htm
Back Hand English
If you have been struggling with compensating your aim when applying english to shots, you should try a technique known as Back Hand English. It is a little bit tricky to explain BHE, but I'll do my best.
BHE works extremely well on short shots, but when the distance between the object ball and cue ball exceed a few feet, it can be less predictable. Trial and error is the key, but most people I have shown this too are quite amazed!
Try it yourself. Set an object ball about 8-12 inches from a pocket. Place the cue ball wherever you like. Setup and aim the shot as if you where going make a centerball hit. Now, without moving your bridge hand, point the cue to acheive the desired english and make the shot. I know, this appears to break all the rules--but it worked, didn't it? It doesn't matter what type of english you want to use--low, high, left, right, or any combination.
It is called Back Hand English because you make the shot by simply changing the position of your back hand. This isn't my invention, it has been promoted by great instructors such as Jerry Briesath and Bert Kinnister. Try it yourself. I can take a lot of the frustration out of using english on those critical shots.
I know that Jeanette Lee uses it. Buddy Hall uses tuck and roll which is simuliar to BHE. Instead of setting the bridge and then altering the back-hand to stroke down a new line with the selected english, Buddy tucks and rolls his backhand DURING the stroke.BHE and Buddy's method both apply english by glancing across the cue-ball to apply it.With parralell english one of course applies their english by stroking straight through the cue ball.
I use BHE only occasionally when the cue ball and object ball are close together. It is very accurate with this closeness.I've seen many players twist with their backhand (ala Buddy Hall) during the stroke to apply english in certain situations.I think that sometimes they don't even know they are doing it and it's just their subconcious making last second adjustments.
Many players use a combination of any 2 or 3 of the different english applying methods. Hey,whatever works! RJ