Frozen to the rail cut shot
Object balls that are frozen to the rail are actually easier to make than object ball that are not frozen to the rail. Refer to the illustration below.

One thing to remember on this type of a cut shot is never hit the object ball first. Here are the guidelines for making this shot:
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When the cue ball is at position A (slight angle), and the object ball is frozen to the rail, you can pocket the object ball by aiming at the imaginary ball (see illustration) but make sure that you hit the rail and the object ball at the same time. Remember, never hit the object ball first.
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When the cue ball is in between position A and position B above, you can pocket the object ball by hitting rail first.
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When the cue ball is between position B and position C, you can pocket the object ball by hitting rail first together with the right amount of english, left english in this case. When I say right amount of english, I mean that as the angle increases towards 90 degrees, you will need to have more english on your shot.
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When the cue ball is at position C (90 degrees), it is actually not very difficult to make this shot. All you need to is hit rail first and the maximum side spin on the cue ball or maximum left english in this case.