That was the biggest unanswered question I had on my first viewing. I will need to get to a pool table with some peace and quiet to really work with it. I also plan to get together with a friend who has studied the subject with Stan. There has to be something to let you know whether you are lining up to A,B, or C.
I gotta admit it is a lot to think about.
Steve
I guess it would only be a lot to think about if this is completely new to someone -- I thought the same things years ago. When you become more experienced, you know immediately what alignment it is. As far as basic CTE - from there it's which pivot direction is the right one and only one is correct. If you pivot one way and it's obviously wrong-- just reset correctly.
There are two variables when using CTE--- sighting the outermost edge "correct eye placement" --- which Stan has simplified as A, B, C and 1/8s for extremes --- and the pivot itself. It's possible to maintain the same alignment for all shots and utilize a highly dynamic pivot that changes not only with distance, but cut angle. Or, you can simplify the pivot by minimizing it to the lowest objective denominator and varying the eye placement to objective points (A, B & C for 90% of all shots).
The more advanced (experienced is prob a better word) you become, you can immediately eliminate over 1/2 of the options, always pivot from the same direction and only figure thick or thin (or even just thin or very thin). Obviously if you have a 80 degree cut to the left, you're not considering alignment A, right?
Hopefully that all makes sense.
For example, it might make sense to minimize the pivot arc/movement and make an objective adjustment on the sighting target. The pivot can be reduced to an even smaller movement (< 1/2 tip) as long as the vector is coming from an offset position to center. The smaller it gets, the more objective it becomes.
Anyways, in conclusion - you must think about the variables initially so you understand what's really happening. Before too long, the answer is instantly apparent.