Interesting website - a German guy with two really great books on 3C, incredibly detailed on everything, position play, systems, why not to use systems, minor adjustments to make due to cue ball curve, coming in to a rail on a sharp angle, etc. Unfortunately all in German, but I got lucky having Austrian parents. He has a website where some of it is translated into English, not always the best English, but pretty good, I think. He presents a shot on a table, and you can click on or off different graphs to accurately recreate them on your table. Then you can click on the various solutions and he comments on the pros and cons of each.
Anyway, a really interesting bit is he sent an anonymous questionnaire to alot of high level players, Blomdahl, Caudron, Horn,etc., asking them to comment on their use of systems, why they do or don't use them, which, when, etc., and some of their comments, all anonymous. There's an interesting grid of about ten players and their answers. Of the ten, they answer using 1 system to more than twenty.
http://www.three-cushion.com/
Table of contents - page 76
Anyway, a really interesting bit is he sent an anonymous questionnaire to alot of high level players, Blomdahl, Caudron, Horn,etc., asking them to comment on their use of systems, why they do or don't use them, which, when, etc., and some of their comments, all anonymous. There's an interesting grid of about ten players and their answers. Of the ten, they answer using 1 system to more than twenty.
http://www.three-cushion.com/
Table of contents - page 76