Well, this may be humbling?but I?m willing to share my video. I tried the shot a number of ways to see how each combination of speed, english, and spin would affect the quality of the break.
I forgot to try Blackjack?s draw shot?sorry!
http://www.youtube.com/watch?v=jwNISCMfjD8
Attempt#1: I tried Bob Jewett?s idea?firm speed with moderate spin & a little inside english. The CB missed the ?gap? in the stack so this worked very well! I undercut the ball, which is my tendency for this type of shot.
Attempt#2: Repeated attempt#1 with medium speed. The CB avoided the ?gap? in the stack so this worked fairly well too, but I don?t like the CB position. I undercut the ball again?I?m surprised I avoided the ?gap?.
Attempt#3: I repeated attempt#2 with less spin. This worked OK although the CB hit the ?gap? in the stack. I undercut the ball again and was lucky the 9 ball came into view. I would not use this combination in play due to my tendency to undercut the ball.
Attempt#4: I repeated attempt#3 without the inside english to help me NOT undercut the OB this time. I caught center pocket and this break worked fairly well. The CB hit the ?gap? in the stack but the balls separated and I got a shot. Although it worked this time, I reached the same conclusion as in attempt#3?I should not use medium speed with less than 1-1/2 tips of top spin.
Attempt#5: repeated attempt#4 with more spin & a little
outside english (to force myself into a thinner cut on the OB). I wanted to see what happens when I overcut the pocket, but I overdid it and missed. Miraculously I still hit the ?gap?! I must have let up on the top?!!?
My conclusion is that going "forward" (toward the end rail) in this situation takes on some risk. I am unsure if this risk is any more than would be experienced with draw, but that can be determined with a little more experimentation.
My choice in the future will be to stroke this type of shot (where the tangent takes the CB into the "gap")
firmly with at least 1-1/2 tips of top spin and a 1/2 tip of inside to mimic what Bob Jewett suggests (bring the CB two rails out to the center of the table).
If I fail to stroke the shot, I will end up hitting the gap and will be relying on luck to end up with a shot.
Your results may vary as you may not tend to undercut this shot like I do.