I understand how the "Provably Fair" system works.  It is not full proof by any means.  Please refer to the link I posted earlier, it is easier to understand from Trevor.  I have quoted a portion of the Trevor/Libertaad conversation below'

"This is why we claim that the browser-based Provably Fair implementation is compromised. In fact, I believe you have alluded to that in your closing argument. If Provably Fair allows a "handful" (or more) of savvy users to ensure the house isn't cheating, and I can show that the remaining majority of users are still vulnerable to exploitation, then the system cannot be reasonably claimed as "fair" and, at the very least, cannot be "provable"."