Andrew Manning said:
I subscribe to the idea that the length backswing should vary directly with the power of the shot. For harder shots, use a longer backswing, and for softer shots, use a shorter one.
For hard shots, too short a backswing means you have to force the cue to get it up to speed, and you lose accuracy.
For soft shots, too long a backswing means you have to hold the cue back a bit rather than releasing through a natural stroke, and you lose speed control.
YMMV, but varying the length of the backswing when varying the speed of the stroke is definitely the right way to do it for me.
-Andrew
I agree with your points Andrew but IMHO the length of the back stroke should be a function of the length of the bridge distance and not by adopting a constant bridge distance and then deciding how far to pull the stroke back.
When varying the bridge length, the grip hand must also be repositioned so as to maintain the nearly perpendicular orientation of the forearm to the cue.
By my observation AT LEAST 90% of all touring pros whose matches I have watched bring the tip back nearly all the way to the bridge hand...sometimes with the entire ferrule disappearing...on every shot.
Failing to do so IMHO promotes a tendency to rush the final forward stroke...i.e. not achieving a SMOOTH transition from back to forward stroke.
Bringing the ferrule all the way back to the bridge hand provides an EXACT point at which to transition from back to forward. You don't even have to visualize how far back the cue is because you can FEEL it.
"Short stroking" requires a diversion of the eye focus in order to tell how far back the stroke has gone...or just guesswork.
As another poster pointed out, we can't just mindlessly copy the techniques of the pros because so many of them use totally different techniques.
BUT...when such a huge majority of them adopt a specific technique, I think that most of us would be ill-advised to ignore the "prevailing wisdom."
Finally, if the stroke mechanics are correct in the first place, then the length of the backstroke will not introduce any particular errors.
Having said that, if the stroke mechanics are lacking, then yes, it might be best to "paper over" those errors by short stroking.
Regards,
Jim