When the cue ball is frozen to the lowest numbered object ball, then you have to shoot the cue ball in a direction that moves the object ball at least a little - in other words, at least slightly toward the object ball. (Note: You can shoot the cue ball straight through an object ball it's frozen to, so long as you use a normal stroke - there's no "push" or "double hit" unless another object ball blocks the path of the object ball or cue ball getting out of the way of your follow through.)...when in rotation games, the cueball is frozen to the lowest numbered object ball or when the lowest numbered object ball is frozen to the rail.
When the object ball is frozen to a rail, then for a "good hit" the cue ball must hit the object ball, and then the cue ball or an object ball must hit a rail. It can be the same rail, but if it's the same object ball then it must leave the rail first (for instance, it rebounds off the rail, hits the cue ball again or another object ball, and then returns to the rail).
These are good questions that even more experienced players ask.
Beware of "rules" you learn playing in bars - they're often only right at that bar (maybe only against that player).
pj
chgo
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