There's two ways to go about such a shot. One is to simply cinch the 8 with some draw, and then just make the 9 up table corner. You'll be shooting of the rail, but that's no big deal. It should be something you make more often than not.
O.K. say you cinch the 8B. A coupla things. One is the CB is now where the 8B was and on the rail to boot. You're tellin' me that from there making the 9B down table is no big deal? That it should be made more often than not?
Give me better odds. More often than not is anything 51% or better.
That's a tough-ass shot for most of us. As a rule, for money, I don't take that shot. All you have to do to improve your odds is bring the CB back 1 or 1 & 1/2 diamonds and 6 inches off of the rail. That's not a major feat.
If I can't do that then I either duck on the 8B somehow or cinch the 8B
and duck on the 9B. I ain't no hero.
But that shot can be made without much effort as I described it before.