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A topped golf shot is caused by a player hitting the ball above its equator. Compare this to a thinned shot where the leading edge of the club face catches the ball below the equator but not low enough to make full contact.
The CB can be caused to curve only with an elevated cue. For explanations and demonstrations, see squerve and masse shot aiming. The CB almost always swerves on sidespin shots because the cue is rarely level, since it needs to clear the rails (see cue elevation effects).