The setup of the two balls in the corner pocket are paramount. Some tables are too tight to fit these in, although I've made it a couple times regardless. Leave about 3/4 of the first ball exposed and try to get a pretty flat hit on the second ball so the cue ball doesn't rebound too far off the short rail.
Make sure to place the side pocket ball in exactly the same place every time too. I like the cue ball 1-1/2 diamonds from the long rail, just behind the headstring (competition requirement). I aim for 1/4 ball hit on the side pocket ball with 1 tip of follow. Juice it up so it hugs the short rail as it goes around. Adjust your aim so the cue ball either hits the first corner pocket ball directly or just hits the long rail right before it.
This is a nifty little shot, whose origin I'm unsure about.
2006 - 2017 © Tim Chin