see diagram:
excuse the whitespace... goddamn windows7 paint, I dunno how 2 get rid of that yet.
Notice how the 1 ball is semi-jammed into the rail.
You sink the 8, it's all over, baby.
Position the cue ball to ENSURE first contact w/ the 8,
contacting the 8 as far let as possible w/o touching the 1.
Stroke must be hard, and w/ gnarly english, to get 8 to spin off at that acute of an angle.
Worst case, opponent still should have a tuff shot w the 1 still close to the rail,
[the 8 pinning it in from immediate rebound b4 it spins off, dampimg the rebound from the rail]
w/ the cue ball way out back [so long as it doesn't end up resting to the left of the side pockets.
Also good place 4 a jump shot [only partial blockage by the 1, short path to the corner pocket for the 8, if that's in your repertoire [not in mine
]