Can't tell you how silly this is. The line in the second diagram is very sensitive to (even minimal) english, but it is EXTREMELY sensitive to speed. And age of cloth, btw. A little too firm and the ball will lock up between the long rails making the line way too short. Not enough speed, it will be a mile too long. Any sliver of unwanted english and it's gone. Practice it till your eyes bleed, go to any other billiard and you're starting from scratch, it's a different shot. The normal bank shot, twice around, may not be a sitter but it has a four of five times higher percentage chance than this attic-study solution that never works in the real world. There's a reason no top player ever uses this solution. The first diagram from the OP is in a different category: that line is eminently useable.