Ok here is how and why.....
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The reason I would do this is that there is a really good chance of either hanging the eight for the average player oging for the cut, or scratching, if you use inside english to 3 or 4 rails, or hanging the nine if you anage to make the eight or only leaving yourself a bank on the nine.
By doing it this way you still have the nine there to make even a hanger difficult to both make and get shape on the nine for your opponent. Even if the eight ball comes back out along the yellow line if you have to hit a little bit hard it's still a VERY difficult shot for your opponent and there's a good chance he'll scratch going for the shape on the nine.
Second, the trick to this shot is to not think too much about where the eight's going because if you get the CB where you are wanting, it doesn't much matter where the eight is...
If you don't have the speed control and CB control to put the CB on or slightly behind the nine, then by all means go for the two tough shots, or the one tough shot on the eight with inside off the rail for perfect shape on the nine, but for me, this would be the percentage shot with the highest liklihood of winning the game and that's against anyone.