Do you now believe that most opening price is determinate? And the initial movement is determinate too? Let's say, if all necessary data is available, the open price can be calculated accurate enough to what is gonna happen, of course with statistics significance.
If that were true, then statisticians would be the "Masters of the Universe." I don't believe that is presently the case.
I'm sorry to burst your bubble, but I have done an extensive research on this subject and conclusively proved that it is not the case. Have a good trading day, Cheers,