Originally Posted by Jmoinen
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There are 2 technique for playing with side. The standard snooker technique keeps the cue parallel to the line of aim, but pool players often cue across the line of aim.
For example, imagine a straight pot, blue to the center pocket. To play with left hand side in the snooker fashion you would move the whole cue left, keeping it parallel to the original line of aim (through center of white, blue, and pocket). To play in the pool fashion you would move the butt of the cue right, moving the tip left, and cueing across the line of aim from right to left.
There are pro's and con's of each method and players of either game may use either technique, I am just labelling them as I think is most common
Using the snooker method, when you strike the white (cueing straight ahead parallel to the line of aim through white, blue and pocket) the white will skew/squirt/deflect to the right, off the line of aim, then over distance/time it will curve back to the left eventually coming back to the line of aim, and then passing over it and ending up to the left of it.
So, to play with side you need to adjust the original line of aim to account for the effects.
If it's a short range shot then you only have to take into account the deflection, and deflection is fairly constant (varies with power and amount of side, but only a little) and depends on your cue end mass (mostly). So, once you get used to your own cue's deflection, you can adjust the original line of aim to account for it, then you apply the side in the snooker fashion placing it parallel to the adjusted line of aim and you should pot the ball.
Once you practice it enough it will become second nature.
For a longer range shot you need to account for both deflection and curve, the curve effect will depend on the angle of the cue - flatter striking causes less curve, it will depend on the power - higher power means later curve, and it will depend on the cloth - thicker cloth means more curve. This effect is much harder to account for, and is why people tend to use side on shorter range shots (IMO). You would adjust for the deflection, then depending on distance, power and cloth you would adjust back by some amount.
Again, lots of practice, and using the same table/cloth is recommended.
Best of luck.
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