LOL - remarkable presentation Andyson! I bet VEM changes the pins while the approach shot is airborne!
Back to my observations: I played
STA F9 "easy pins" again, one "hard" and two "easy" in total. The result
is, 3x identical pins in all three rounds, 4x variable "easy"
positions, meaning that they once copied "hard" and once not, and only
2x "easy" positions being constantly different from "hard".
That
means, only 2/9 = 22 % of the time they are really different between
only three rounds. Thus, I'm not convinced of dedicated "hard" and
"easy" pin positions.
Nevertheless: Thank you Tiger for your insight!