To put it more instructively, what meant before and the other Straight Pool aficionados are alluding to here, when I teach the game, I want students to check the tangent line from the object ball to the rack and figure out what the cue ball would do if they did nothing to it (a paradox or impossibility, but the purpose is simply for them to see where exactly the cue ball hits the stack, realizing that the stack isn't literally a pile of something, but consists 14 individual balls, one or two of which the cue balls is going to hit coming off that break ball. The second question I'll ask is whether it would make sense to let the cue ball do that - which they've figured out it would do naturally (= will the cue ball go where the balls that open up are going, or will it stick/get stuck, or scratch, or be left with nothing to shoot at etc.). All depends on how accurately one reads the contact point, simply because the object ball is so close to the rack that it will slide/glance and hit a specific point regardless of what spin etc. the player applies (assuming of course one is not going to slow-roll or soft-draw this). What I mean earlier saying there is no definite (or standard) answer was that the extent to which one can read the contact point, that is, how precisely one can predict what's going to happen, goes beyond what I could tell from a photograph, however well taken. While it does look here as if the cue ball will glance off the 15 and forward, so that following three rails to the center of the table would be best, from the perspective of the picture, I'm unable to tell with absolute certainty the cue ball will avoid the 11 completely regardless of how hard one hits it - and that "detail" is going to make all the difference here! If the cue ball so much as grazes the 11 before contacting the 15, there's a possible scratch here. In short, I'd prefer to inspect any such break shot (positioned on the "wrong" side or the bottom row of balls), so to speak) in person, from up close.
Greetings from Switzerland, David.
_________________
„J'ai gâché vingt ans de mes plus belles années au billard. Si c'était à refaire, je recommencerais.“ – Roger Conti