Yep....when I looked at the Combined Database it has a suspicious look for Doubles to play. Consulted my friend in South Carolina and he was coming up with 700, 744 and 755 in his system as well.
In the past I have often been good at catching double prediction when they come around. It's one of the "facts" I track. A "total system" is looking at the entire picture of things. I dont have a little "one page" system. It is very deep and involves 30 charts to consult before I set filters in my software.
May sound like a lot of charts but sometimes what I cant see in one chart for a decision I can in another. The charts "crosscheck" each other and actually the charts are a recording keeping system I've developed to determine what is about to happen. My software which is designed to work with the charts is merely a "tool" to obtain results based upon what Im reading in the charts.
There is no mathematical formula to it. It's just understanding the 1000 combinations and applying the facts from game to game.