I think the reason I don't need side is that (1) the shot's basically straight in, so it has to be hit firmly, making the CB go wide before hitting the rail, and (2) hitting firmly also creates more contact-induced spin, widening the rebound angle a little.
pj
chgo
View attachment 520127
This is how I would do it. At least on a barbox. The trick, in my mind, is about speed. I want to hit the cue hard enough to move the 3 a few inches to make both the 2 an easier shot as well as giving me adequate room to make the 3 after. Hit it too hard and the 3 might bounce too far, turning that shot into a sharp angle reverse cut, maybe even a bank. Don't hit it hard enough and basically I've made the 2 a more difficult shoot-over-the-top of the 3.
I have league tonight so I'll try to get there early and give this a try.